My friend just bought Oblivion and his graphics card is currently the GeForce FX 5200. The game is super laggy and we're assuming that it is the graphics card. He does not have the money to put into a 6800GT, but I was wondering if it'd be better to go with the 6800 or the 6600GT. The 6600GT is cheaper and I've heard good things about it, but at the same time, I am not sure if it is really worth it to put the extra money into it to get the 6800. Thanks guys!