I don't use screensavers, so I know nothing about that.
When I first got my card I started HL2 at 1920x1200, everything absolutely maxed and I just loved it. Just an amazing, immersive experience (finished it Friday).
I just started FEAR, which cripples my system but I am not really even finding it that exciting. Hopefully it will get better as things progress.
COD2 looks great and is a lot of fun with lots of the eye candy on. Very cool game.
Um, that's all I can think of right now