Im looking to get the new iMac 24" with the Nvidia 8800GTS video card. Im caught between the 2.8 and the 3.0 not sure about the performace vs Price for the 3.0 over the 2.8 with the same specs. Im coming from Last years 2.4 Aluminum iMac. I want to upgrade for the Video card alone the 2600 is a horrible card for gaming the Nvidia makes me happy So is the 300.00 worth the price? or just put that in the RAM 2 to 4 on the 2.8?