hey guys i'm thinking about upgrading my current core 2 duo 2.16ghz imac with a shiny new aluminum one (maybe today ). mine has been having problems running it for a while, random system lock ups and all sorts of stuff. thinking about springing for the higher end 21.5" model. can anyone with this model tell me what kind of performance i can expect? what graphic settings can you run? WoW is the most taxing program i'll run on the computer, and i do play quite a bit so its important to me to be able to run it well.