Maybe try a little research, NVidia don't just have the 8800GTS, they also have the 8800GT, which is the same price and aimed at the same market as the HD3800 series, but runs at nearly (~90%) the speed of a 8800GTX (~40% faster than ATI 2900XT).

I have been a fan of AMD and ATI for over 5 years, I have bought 2 systems this year, one for me and one for my partner. One system had a 2GHz clock AthlonX2 with an ATI graphics card. The other had a 2GHz clock Core2Duo with NVidia. All other parts are identical (except mobo).

The Intel system boots around 20% quicker than the AMD and benchmarks around 20% better than the AMD/ATI system for games and processing tasks.

When looking at the other characteristics, they both have the same water cooling system, the AMD system runs at about 39*C with a constant whirring of the fan, the Intel system runs at about 28*C with the fan on it's lowest setting.

I would gladly pay the whopping £20 difference in system prices for the Intel system to have a system that is quieter and more energy efficient than to pay a little bit less to have a lancaster bomber sitting in my office that can also run the radiators in my house.

And just so that you know, every system I have built in the last 5 years has been AMD based and unless AMD can pull a cool running, high-performance rabbit out of their hats then I dont want to know about their 55nm range.