I have LCD monitors at 1600x1200 so that is what I pay attention to most. I want to be able to play anything above 30 FPS. Anything else is gravy. Min FPS is more important to me than Max. I hate stutter. Usually happens at the most inopportune times during game play.
Oblivion seems to be the game that makes and breaks setups. I noticed that the ABS Ultimate 9 with ATI cards kicked NVIDIA’s butt at 1600x1200 among other resolutions. See Toms review Game On With the Ultimate X9 from ABS Computers. But if you look at Toms VGA charts NVIDIA kicks ATI’s butt. So what contributes to the difference? It must be the CPU power required to feed the graphics cards or newer drivers. I am betting ATI requires more CPU overhead to feed its card but once fed does better in Oblivion outdoor.