All 1st editions, all done in the pre-digital era
#1 Metallica - "Metallica" aka "the Black Album" - it's my reference disc when I audition new gear - it's a masterpiece in so many ways.
#2 Dire Straits - Brother's in Arms
#3 Pink Floyd - DSOTM and The Wall - tie? (does anyone have any idea how difficult it would be to make an album like DSOTM without today's technology???
#4 U2 Achtng baby - not even a u2 fan but I will listen to this album to make my brain tingle
#5 Kind of want to say Def Leppard Hysteria...or not. Maybe a Genesis album, Police or hmmm lots of #5s