Hi, I'm planning to buy one of the current MacBook Pro 15", but I'm not sure if I should buy the 2.2 GHz low end version or the 2.4GHz high end version. The 2.4 GHz version has a AMD Radeon HD6770M, but it's underclocked, so there should be no big difference to the HD6750M in 2.2 GHz model. I think most of the time I will use the MacBook at home where it will be connected to a 24" monitor with a FullHD resolution (1920x1080) and maybe I will also use the MacBook display at the same time (dual screen). I'm a computer science student and I will need the MacBook for developing software and so on. But I don't play many games. So now my question: Is the Radeon HD6750M in the low end model capable for a dual screen setup? Because it has only 512MB VRAM. Or should I better go for the high end version with 1GB of VRAM?