It's not $800. It's like $600. In either case, that's expensive! I wouldn't buy a 7900GTX, it's a P.O.S in my humble opinion. And from the benchmarks, it seems that way as well...
It's about on par with the X1900 XTX with this big-ass modified Quadro cooler. Bleh...I prefer ATI's dual-slot coolers. Becides, it has ATI's mascot, Ruby on it and she's hot. Totally owns nVIDIA's mascots.