I have an iMac 24" with 2GB Ram, Intel Core 2 Duo 2.4Ghz processor, and an ATI Radeon HD 2600 Pro 256 MB and resolution up to 1920x1200. I'm sure that my processor could run this game, but I'm unfamiliar w/graphics cards. Would mine stand up to Crysis? Also, since I have a Mac, I would have to also purchase a copy of either XP or Vista as well, which run up to the $100s range. My question is: could my Mac run this game, and would it be worth it to buy XP or Vista just for this game? Also, if I did, which would be the more practical choice (XP or Vista) and why?