I have absolutely no feel for what a "good" video card is as installed in various iMacs. i have a (new-to-me) iMac Core i3/3.2 GHz coming and it has an ATI HD 6750 512MB video card in it. Since I do no gaming (on or offline) and use it mainly for processing photos, does anyone want to throw in their two cents worth on the value/reliability of this card vs. any other kind of card from any other manufacturer? Any specific sites (other than Radeon's) that I can visit to give me pros/cons or comparisons? Tnx.