I'm referring the higher and highest end graphic cards available on the 27" models of the iMacs. I plan on creating and editing 1080p content in the future and would like to not be bottlenecked by the graphics card for a change. My current iMac (first gen ALU 20", base configuration) just barely plays 1080p clips with minimal stuttering. It's fast otherwise. I ask because I plan on getting my next computer in a year and need some options. I obviously want to stick with OSX so that limits my choices, I am between either the highest end iMac or a Mac Pro with the highest end graphics card or similar. What do you guys think?