Three of those stand out to me -- Loveless, Laughing Stock, and Achtung Baby. Of the three, I go back to Laughing Stock the most -- not only was it genre-defining (with Spirit of Eden, of course), it's still one of the best examples of that genre as well.
And I have waxed poetic many a time about Loveless -- it's just such a unique album -- Kevin took some of the most unlistenable snippets of guitar noise and looped them and made you listen to them until you heard the beauty in it that he heard. It's not just shoegaze, it's on another plane entirely -- by itself, unfortunately.
Achtung Baby sort of hits me the same way indian summer does -- it's that last bit of brilliance from a band that left me cold a long time ago (Rattle and Hum). So holistic in its production, songs range from their best ("One") to only above average (e.g. "The Fly") -- yet still sounds great within the context of the album.