Couple that I think are reallly good:
-Not on my system if you read my earlier post, but UT2003 is amazing on a pretty good rig
-SOF2: Double Helix-Yes the gameplay can be so-so at certain times, but the models and enviroments are really good.
-MS combat fighter-Not sure on the title, but it was previewed in Comuter Gaming World, and the screenies looked amazing!
Just my thoughts.........