I need a laptop for college and I in a dilemma whether a should get the New 13" Macbook Pro 2.53ghz/250gb or the old 15" Macbook Pro 2.66ghz/320 gb. The old 15" MBP decreased its price because of the New 15" MBP and has the same price with the New 13" MBP. The New 13"MBP has 7 hrs battery life and SD card slot while the old 15" MBP has 2 video cards, better processor and more HD space and I think it also has a better screen but it has only 4 hours of battery and I'm thinking if it's too big. I don't know which one is better the new 13" MBP(2.53ghz) or the old 15" MBP (2.66ghz). also, is the screen the same or the old 15" has a better screen?