I am thinking of buying a 13" air (1.86GHz, 4GB, 128GB) but I want to be sure I will be able to run Xcode 4 without any problems. Any developers here running Xcode 4 in lion? I searched and I know the current Xcode runs fine, but 4 is a bit more resource intensive. The laptop will be used for general stuff like web, email, word, excel and iOS development. I am trying to decide between an air and a Vaio Z as those are the only ultra portable laptops I found that have a higher screen resolution. Vaio Z is more powerful but also hotter and louder... so I think I lean towards the Air, but I want to make sure it handle iOS development.