I'm about to buy a MacBook, and I can either buy the 13 or 15 inch model. If I got the 13 inch I would completely max out the specs, and if I got the 15 inch I'd have the discrete GPU, with the 2.3ghz i7 and 512GB ssd. My worries are that the 15 inch will be too large/heavy, and the 13 inch...