With the latest series of graphics cards (ATI X800 vs. NVidia 6800), you will definately want Nvidia. The third top card in the 6800 series owns the highest card in the ATI X800 series. Plus, there are many problems with the drivers for the X800 that will cause tremendous lag in DX9 games such as FarCry and Doom 3. The X800 does great in DX8 games though. Also, the 6800 has Pixel Shader 3.0 support, as the X800 series does not. In this war, Nvidia is the clear winner. Go with the GeForce 6800 GT.