GTX295 - if you want the best, 4870X2 - best bang for buck (XFX card is now £235), 4890 - Perfectly adequate for your resolution if you are on a budget (£140). Personally I would go for a pair of 4890 in Crossfire (£280 and have a set-up equal or better than GTX 295). Good luck, it's pleasant problem you have ;o)

HD 4890 now £140 from overclocker.co.uk

Ok, thanks. So if you only have one ddr2 ram chip instead of 2 chips, it wont be ddr2?mark30001

DDR2 is the second generation of DDR ram, the current gen is DDR3. If you have one chip youwill be running in single channel but it always be DDR2. WRT running in dual channel this iscommon practice and in essence doublesyour bandwidth thus highly recommended.