Ok. I'm heavily considering purchasing my first Macbook (Well, Mac product ever). But I'm torn between a 15'' and 13'' version. I'll mostly use it for school. I may do some graphic design on it and some photo editing. I see the 15'' version starting at $2000 versus a 13'' with similar configuration for 1799. Is the extra 2'' worth it? I may connect it to an external monitor from time to time. I was thinking about the 13'' version and using the $300 savings to get AppleCare/SquareTrade. Any tips or someone who's used different sizes? BTW, I have a Windows 8 PC I built with a Core i5 3570K processor and was thinking about slappin' in a GPU soon. So I don't need the most beastly Mac. But didn't want to make too many compromises. Sorry I'm considering the Retina!