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Now, these are what I think are the best "Well Known" certainly not my choice for the best, just the ones that most people know of...End Quote

What are your choices for the best, well-known or not? That's what mine were, although I could have gone on and on, but I stopped at eleven. :) Not necessarily well-known, but I don't care. They're some of my top synth songs. :D

Absolutely Vile

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Madness - Our House

Just my opinion, of course. ;D 8)

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Would you class 'Our house' as synth, Hairspray? I've considered the band to have ska roots which kind of reflect in this song.

I agree with 'Keep feeling fascination' - Great song!

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Don't forget the FIRST all-synth song, "Lucky Man" done in 1971 by Emmerson, Lake, and Palmer.

They had this great synth solo using the Moog Synthesizer.  It was the first hit record to use synth in a big way.  :D
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Define "synthesizer" and define "song."
For instance, I have a record of the 1954 RCA Mark II synthesizer programmed by Dr. Harry F. Olson, performing, among other pieces, Debussy's "Claire de Lune."  That's about as early as I can cite an actual "synthesizer" recording. I know there were actual songs recorded a few years earlier on inchoate synthesizers, but I can't cite them specifically. There were early electrical and acousmatic methods ranging from Alexander Graham Bell in the 1870s to Pierre Schaeffer in the 1940s, but these devices, employing oscillators, magnetic tape, and the like, are not classifiable as "synthesizers."

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Define "synthesizer" and define "song."
For instance, I have a record of the 1954 RCA Mark II synthesizer programmed by Dr. Harry F. Olson, performing, among other pieces, Debussy's "Claire de Lune."  That's about as early as I can cite an actual "synthesizer" recording. I know there were actual songs recorded a few years earlier on inchoate synthesizers, but I can't cite them specifically. There were early electrical and acousmatic methods ranging from Alexander Graham Bell in the 1870s to Pierre Schaeffer in the 1940s, but these devices, employing oscillators, magnetic tape, and the like, are not classifiable as "synthesizers."
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Were these songs considered "hits" ?

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Were these songs considered "hits" ?
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Of course not.  If you stipulate "hit" songs, then your ELP "Lucky Man" is first.  I can't think of an earlier one.  The Beach Boys' "Good Vibrations" used a Theremin.  Theremin is an electronic instrument, but not a synthesizer.
As to who first brought the synthesizer to the masses, that distinction belongs to Wendy (nee Walter) Carlos of "Switched-on Bach" fame.  "Switched-on Bach" (1968), "The Well-Tempered Synthesizer," and "Clockwork Orange" soundtrack (1972) all went gold (and eventually platinum).
People poke fun at these records as camp, but they don't see the achievment of Carlos' works from this period.  She started with white noise and "synthesized" complex classical works note-for-note to the greatest extent technology would allow.  Today, any idiot with a computer and some cheap software can make electronic music, but it took stupendous discipline and vision to accomplish what Carlos did in the '60s.

It's amazing how fast electronic music moved from the academy to the popular sphere.  In 1965, university scholars such as Milton Babbitt and Vladimir Ussachevsky were creating abstruce electronic works using switch-and-wire circuit synthesizer technology.  Electronic Music research was also the domain of the telecommunications industry.  For instance, James Tenney and Max Matthews were developing the first digital electronic music technology at Bell Labs.  
A year earlier, Dr. Robert Moog and co. had integrated the keyboard with the synthesizer.  W.Carlos popularized the Moog a few years later, as I mentioned above.
Don't forget, The Beatles also used the Moog.... "Because," "Maxwell's Silver Hammer,""I Want You."

The Minimoog came out in 1970, making it portable.  The keyboard synthesizer was a pop music staple within a few years.  Think Yes, ELP, Pink Floyd, Tangerine Dream, The Who, Kraftwerk and so on.

How does this relate to '80s music?  How does it not!  Until the late '70s, synthesizers were the province of studios and the platinum selling groups who could afford them.  In 1979, a newcomer from the new wave scene, Gary Numan, has a HUGE international hit with "Cars."
Only 14 years earlier, the biggest synthesizer hit was Pauline Oliveros and "Alien Bog."  :D

Quoting:A year earlier, Dr. Robert Moog and co. had integrated the keyboard with the synthesizer.End Quote

The Monkees used the Moog synthesizer in many of their tunes. The instrument proved to be revolutionizing to them.

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Of course not.  If you stipulate "hit" songs, then your ELP "Lucky Man" is first.  I can't think of an earlier one.  The Beach Boys' "Good Vibrations" used a Theremin.  Theremin is an electronic instrument, but not a synthesizer.
As to who first brought the synthesizer to the masses, that distinction belongs to Wendy (nee Walter) Carlos of "Switched-on Bach" fame.  "Switched-on Bach" (1968), "The Well-Tempered Synthesizer," and "Clockwork Orange" soundtrack (1972) all went gold (and eventually platinum).
People poke fun at these records as camp, but they don't see the achievment of Carlos' works from this period.  She started with white noise and "synthesized" complex classical works note-for-note to the greatest extent technology would allow.  Today, any idiot with a computer and some cheap software can make electronic music, but it took stupendous discipline and vision to accomplish what Carlos did in the '60s.

It's amazing how fast electronic music moved from the academy to the popular sphere.  In 1965, university scholars such as Milton Babbitt and Vladimir Ussachevsky were creating abstruce electronic works using switch-and-wire circuit synthesizer technology.  Electronic Music research was also the domain of the telecommunications industry.  For instance, James Tenney and Max Matthews were developing the first digital electronic music technology at Bell Labs.  
A year earlier, Dr. Robert Moog and co. had integrated the keyboard with the synthesizer.  W.Carlos popularized the Moog a few years later, as I mentioned above.
Don't forget, The Beatles also used the Moog.... "Because," "Maxwell's Silver Hammer,""I Want You."

The Minimoog came out in 1970, making it portable.  The keyboard synthesizer was a pop music staple within a few years.  Think Yes, ELP, Pink Floyd, Tangerine Dream, The Who, Kraftwerk and so on.

How does this relate to '80s music?  How does it not!  Until the late '70s, synthesizers were the province of studios and the platinum selling groups who could afford them.  In 1979, a newcomer from the new wave scene, Gary Numan, has a HUGE international hit with "Cars."
Only 14 years earlier, the biggest synthesizer hit was Pauline Oliveros and "Alien Bog."  :D
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I've heard Switched-on Bach,it's incredible what Walter/Wendy Carlos was able to achieve with the 60's era MOOG with its complicated plug-ins and dials. Synths like that were unlike the "use right out of the box"keyboards of today such as Ensoniq,Casio,and Roland stuff! 8)

Quoting:
Don't forget the FIRST all-synth song, "Lucky Man" done in 1971 by Emmerson, Lake, and Palmer.

They had this great synth solo using the Moog Synthesizer.  It was the first hit record to use synth in a big way.  :D
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i thought i throw my hat into this synth debate. del shannon recorded the song 'runaway' in 1961. in that song you hear a distinct sound of an electonic organ. this organ is called the musitron. it was developed by a man named max crook in 1959. the song 'runaway' was a big hit.

the thing with the musitron and it's inventor was he never patent it. the machine was already full of patents. that's why bigger names like moog get credit. of coarse electronic music has been in the scene since the theremin, so the idea of one concrete inventor of electronic music and how it relates to hit songs can still be debated.

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We are all forgetting Trio's - "Da Da Da Da"

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That's "Da Da Da I Don't Love You You Don't Love Me Aha Aha Aha," and some of us WANT to forget it about it, but we CAN'T, and we end up SINGING it to ourselves in the CAR!  Aaaarrrgh!!!
>:(

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What about (atleast in the video) the "one finger synthesizer sound" of any Flock Of Seagulls song?

Also, "Regret" by New Order (help me out here, was that 80's or 90's?)

The ULTIMATE song done by synth would be "Just can't get enough" by Depeche Mode
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I love AFOS' use of synths, though your "one finger synthesizer sound" master was Duran Duran's Nick Rhodes.  Rhodes made it known he preferred songs he could play with one finger.  Whatever works!  He made them all sound sooo good!
I wouldn't call "Just Can't Get Enough" ULTIMATE, but it's up there!
"Regret" is from 1992.  New Order REALLY let me down.  I refuse to listen to any New Order post "Technique."
>:(