If you're talking about audiophile quality sound, my top five
would be:
Pink Floyd- "The Final Cut" (heads above Dark Side for sound)
Dire Straits- "Love Over Gold"
Rough Trade- "Weapons"
Human League- "Dare"
New Order- "Blue Monday" (the 45rpm 12 inch single)
Production value-wise, it's a matter of taste. I like
Kate Bush- "Hounds of Love"
Cocteau Twins- "Heaven of Las Vegas"
Beatles- "Revolver"
REM- "Out of Time"
Jimi Hendrix- "Electric Ladyland"
(ironically, none of them have particularly good sound).