Agree with [email protected] - just look at the benchmarks on tom's hardware guide - the extra memory makes little or no difference in performance, the GPU is the most important thing so buy the best you can.
gmcneely. My friend we need more info before you can get quality advice. These forums have good folk wanting to help so fill us in with your computer info and requirements and let the lads do their bit. If you want to do you own homework then click here is excellent. They recommend either the Radeon 9800 Pro or the 5900XT with your budget in mind. As posted before it depends on your requirements and system. Hope that helps.