Leadtek WinFast PX6800 GT TDH (GeForce 6800 GT) - Obviously, the 6800 GT should slap around the 6600 GT like a freshman in a locker room. That will not surprise anyone. The main thing I want to look at is if the price premium that the 6800 GT demands is worth it.
For example, if 6800 GT performs less than 20% better than the 6600 GT on the majority of the benchmarks, perhaps paying twice as much for the higher-powered GPU is not worth it.