Pearl Jam - Ten (just because I'm more familiar with it and I'm too young to have heard it overplayed/hyped in the early '90s)
The Moody Blues - Days of Future Passed (only heard it in its entirety once so I dunno, and I don't like "Nights in White Satin". I do really like the other six big ones)
I know I've given you shit about jazz before but IMO Out to Lunch is awfully avant-garde for a list of popular music. I could be wrong but I think it would have sold a tenth of Time Out or Kind of Blue.