Hi, i want to get a new MacBook Pro late 2013 model. i'm an app developer so i mostly use xCode, Pixelmator, sometimes garageband, and the web simultaneously (the usual working scenario). I want to get the 15'' model as i much comfortable with bigger screens for programming (if you think the opposite tell me why?) i will upgrading from a 2010 macbook pro. So i'm lost between getting the low end or the high end. My only concern is the graphics. Will Iris Pro satisfy my needs as a programmer? is integrated graphics repairable in case of any issue? do you think i should upgrade for the high end model? Thank you!