Tempting. After tax+shipping, that's about what I ended up paying for my 7800GTX (I was an early adopter and got the first good deal for it before the REALLY good deal came along).
But then again it's not a huge leap over the 7800GTX, no new tech introduced, just a minor speed bump that would probably require serious modding if it could work at all in the 9300/Gen2/M170.
I'll either just pass up the 7900GTX completely, or wait until I've seen confirmed, detailed, photographic evidence of it being used in a 9300/Gen2/M170.