I'm looking at purchasing a MBP, but I have relatively limited funds. Sad thing is I have no real need for one as I own a 15 inch Windows Laptop, Netbook, and iPad... I just kind of want one... Anyway... If i purchased one I'd want to be happy with my decision on screen size. I'm just looking for recommendations as far as the 13 vs. the 15 inches... Any other advice would also be wonderful for a PC user looking to switch to a MPB. Anyway of justifying a need for this purchase could also make my life easier... thanks!