Yes, but to get that one he would have to change motherboard, RAM, CPU and probably PSU too. The entire computer, in other words. (the 8800GTX is rumored to use 300 watts on its own!)
Besides, I would not get the new DX10 cards anyway, the first gen is usually overprized and replaced quickly.
(And Vista is allready in heavy need of a service pack, I read somewhere)
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