A few weeks ago I picked up Deus Ex 2, Independence War 2 and Unreal: Return to Na Pali from ebay; pretty good deal for $35 especially as they were all unopened.
I just finished DX2 and had mixed impressions. The framerate was by far the biggest problem; it is anywhere between decent and terrible, which is hard to understand considering that the game doesn't look all that good. The graphics aren't bad (except for some textures), but a game like UT2004 that uses the same core engine both looks and runs much better on my machine. It definitely feels like it was rushed and the console influence is evident in a number of places (simplified inventory system, no localized damage, unified ammo, etc.). On the plus side, the already great nonlinear gameplay of the original has been made much better and the story is excellent, so it's worth playing through a few times, although I am not going to be doing that with my current hardware.
I probably will be picking up UT2004 very soon as well.