Right now, the sweet spot that I can see is the Athlon64 3400+ (which lets you get into a cheapish socket 754 motherboard, and the 939 really doesn't buy you a lot anyways) and the geforce 6800GT, which is just an underclocked 6800 Ultra for about $100 or so less.
Unfortunately the X800 Pro has a lot fewer rendering pipelines than the X800 XT, so it's a much worse deal than the 6800 GT
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