EVGA 8800GTS 512mb - £211
Comes bundled with Crysis which it runs in it's sleep and EVGA has a step-up program, that if they release a better card in the 3 months after purhcase, you can send the card back for that one (think you gotta pay the price difference).
Tip: ffs, just adjust the fan speed asap, it defaults at 30%