So I am on the verge of purchasing my first macbook pro. Like many beginners, I have been surfing this forum to educate myself. I am drawn between a 13" and a 15". I was wondering what is the major difference apart from the processor, screen size and graphics. I have customised the 13" to 750GB ATA, 8GB ram. The 15" is the 2.2 with 750 ATA, 8GB ram. It costs a fair bit more so I was wondering if the 13" could be a better option. How much better is the 2.0 quad core compared to the 2.7 dual core. Thanks!