Hi all, Just bought a new mac pro from Apple and awaiting delivery. I've always been an iMac man so upgrading is all new to me. When ordering I opted for the 8800GT but have heard a few bad things about this card (unless its gaming) and have seen a lot of people replacing it with the Radeon 3870. Would this be a worthwhile upgrade? I'm not a gamer but do some CS4 work. Could I run both?