Hi, I am buying either the 2.93 or 3.0GHZ I-Mac. I will use it for business purposes, web, and some gaming (WoW). Since the 4850 ATI seems to be encountering massive issues, would I notice any drop in quality upgrading to the Nvidia 130 512MB card? It'd be an extra $50 for the ATI which obviously has a ton of issues. I guess my question is, is this ATI simply a faster card for the Photoshop type users, or would WoW players really notice much more quality?