Here's something that may help you. Look at my system in my signature, and I'll tell you what I get in games. Here are a few that I play a lot:
Far Cry: 1280x1024, high settings (some very high), 50 FPS average.
Star Wars: Republic Commando: 1024x768, highest settings, 45 FPS average.
Tribes: Vengeance: 1280x1024, high settings, 45-55 FPS average.
Halo: 1280x1024, high settings, 45 FPS average.
Sacred: highest settings possible, have no idea what the FPS is but there is no lag whatsoever...
So, what do you think?
Oh yeah... I'm good!
(Watch someone come out and say, "Hey! Those FPS ratings are terrible!"...)