Well, I don't know how much help this would be but I have done some research recently as I am planning to go dual 6600GT's (I'll buy one first, save up some money and buy the second one) I am an fanatic ATI user. But as far as I have seen, nVidia cards of the same caliber perform better at higher resolutions. So, especially if you are planning to use your notebook with a hi-res capable monitor, 6800 seems to be a real good choice.