I am about to order a MBP15 for college to replace my bulky desktop. I want to game on it, something along the line of Starcraft 2 and maybe BFBC2 if possible. Is it worth it to get a 512mb i7 version? I would love to spend as little as possible so my plan is to get the cheapest 15" with matte screen if 512mb doesn't make much difference.