Hi! Still waiting on my iMac, and I can't wait to play games like Far Cry 3, Crysis and Alan Wake. I remember some years ago I used sound cards with surround sound engines. What is the state of surround sound in gaming today? Is it possible to have surround sound when gaming on my iMac (late 2012 model)? Is there any external usb sound card that can produce HQ 4-channel surround sound (with reverb effects, occlusion effects etc..)? Might as well go for great sound to go with my great iMac (whenever it'll arrive).. Anyone? Thanks!