Eey guys, I want to replace my current macbook white 2.4GHz intel core Duo with the GMA X3100 graphical card. The problems I am facing with this model is that my HD files are not projected fluent on my 40-inch full-hd screen. I am not an heavy user since I do not play games or use any havy programs on it. Do you guys think that the new 2.4GHz with the NVIDIA GeForce 320M graphics card will already solve my problems or is it better to go with the 15-inch model that has the i5 processor and the NVIDIA GeForce GT 330M 256MB graphical card. I prefer the size of the 13-inch case but if the difference in performance is that big between the 13-inch and 15-inch models I am willing to pay the extra price.