6800 is pretty cheap, i bought it for 300 six months ago, now it is sub 200.
One card that can beat out TWO of the current top of the line cards, and use less power to do it...that's pretty impressive....NVIDIA's new card, the 7800 GTX, is not only faster than the 6800 Ultra, but also requires 50% less power from your PSU. The card has more than 300 million transistors, which is ridiculous and makes it the most advanced Graphics processing unit (GPU) to come from NVIDIA so far. In some gaming benchmarks, the new 7800 GTX showed up to 2.3x the performance of a DUAL-slot SLI Based GeForce 6800 Ultra system. The 7800 only requires a single slot.
The card uses the new MS DirectX 9 Shader Model 3.0 engine and the new 128-bit floating core point which is supposed to provide film-quality vidual effects, such as high dynamic range (HDR) lighting and real-time frame rates.
For HDTV fans, the new GeForce 7800 GTX is capable of 1080p HD output and supports both 3:2 and 2:2 pull down and advanced scaling and de-interlacing capabilities, so you can output HD to either a computer monitor or your television.