Hi! I just want to know if Xcode is usable on the mpb 13"? I originally planed to buy a MBA 13" but I'm getting cold feet... I like that the mpb can be upgraded to 16gb and that I can upgrade the hdd and even add a second one. But I'm unsure about the 1280x800 resolution and Xcode. This won't be a problem when at home, since it will be hooked to a tb display.