Hmm, it's a difficult one. I'd have to consider Pavement, Neutral Milk Hotel and Radiohead, along with My Bloody Valentine (in particular for Loveless), Slint (for the definitive post-rock album Spiderland), Yo La Tengo and Built To Spill. Whilst I love Wilco, it would be hard for me to place them in the list given that YHF, for me their best album, isn't a 90s release.