Another thing to consider is the monitor. Your video monitor can and will have an impact on performance.
The CPU you are chosing will cause your system to be fill-rate limited as the CPU will be fast enough to keep up with the video card, which leaves the monitor as your last bottleneck.
I would recommend the NEC FP950 19" monitor. It has a perfectly flat screen (sony's new flat screen trinitron tube), and can run up to 160hz scan rates. This is the fastest I have been able to find anywhere.
At 1024x768 you can set the scan rate to 136hz, which (with v-sync enabled) should yeild frame rates of approximately 65. At 1280x1024 you can run at 102hz (nec recommends 85hz), which will give you about 50 frames/second (w v-sync enabled).
Just make sure your video card will support up to 160hz scan rates. A number of them do not, even the newer ones.
A note; the flat screen takes some getting used to after looking at curved screens for the last 20 years, but then when you look at those curved screens, they start to look like a movie being projected on a balloon.

The black levels of this monitor are superb and the multi-point convergence system allows and incredible degree of control on lining up the colors.
Be sure to set the color temperature to 6500 degrees as out of the box it is set to 9200, which is way to bright and casts a blue tint to b&w images.
Of course if you got the money, the FP-1350 (21" version) is out of this world. It is slightly faster than the 950.
Keep in mind these monitors are pretty heavy. The 950 weighs in at 60 U.S. pounds and the 1350 is at 75 U.S. pounds.
------------------
Roy "Skuzzy" Neese
President, AppLink Corp.
http://www.applink.netskuzzy@applink.net