I am eying the 27" iMac, looking to buy when they refresh the line. I will primarily use the machine for Garage Band and other "Mac-centric" applications, but I do want to play the occasional PC-only game (Star Wars: The Old Republic, for example). My concern is that the native resolution of the 27" is so high that it's already stressing the video card before you try adding on anything like AA. I've found in the past that running games at a resolution lower than native can result in a "muddy" image. How is the image on the 27" when running games at 1080 instead of the native resolution? Would I be better off going with the 21"?