Very difficult to answer...
maybe:

Pink Floyd - Dark side of the Moon
Pink Floyd - Meddle
Pink Floyd - The final Cut
Therion -Theli
Metallica - Kill'em All
Opeth - BlackWater Park
Anathema - A Fine Day to Exit
Devin Townsend - Physicist
Led Zeppelin - II
Deep Purple - Machine Head

The Wall Album from Pink Floyd sure is amazing, i love it to, but those 3 i mention, are in my opinion in a higher level for the year they were made. Final Cut was almost a Roger waters album performed by Pink Floyd, but very good. Dark Side of the Moon, is for me the best album ever of all time. the wall is good but i have to be in that special feeling to listen to it, this reminds me the Umaguma album... hard, very hard to listen. Meddle is superb to, all songs are good, but echos is amazing.

I didn't put on the list "Wish you were here", because only Shine one you crazy Diamond (1st and last rack) are absolutely perfect, the rest o f the album is not so good. the first track Shine one you crazy Diamond (parts I-V) is the best song ever. Shame that the rest of the album is not so good.