Nice picks! Roxy Music deserves vaulted mention imho, although some might not call it "synth-pop," and none of it is "lost." ;) Also, anyone remember what Ministry sounded like back then? Picking it up just as the 80's closed, Elegant Machinery helped keep the genre alive through the 90's. De/Vision and And One are probably better known, though. In 1994, Lassigue Bendthaus branded itself as "world famous technopop" on the album "Render," although the project remains obscure. ;)
I'm glad I found this thread. There are several bands mentioned I'd never heard of.