I already know how to program in general but need an Apple Computer for compiling and working with xCode. I will also learn how to code for iOS. Usually there is the macMini recommendation, but I would like to have a system which I could carry with me, it should have an SSD. The Air is in a mid cycle, and the retina is kind of expensive. What would you recommend me? Or is it highly likely there will be another model coming out soon? Is running the emulator for iPad Retina taking lots of resources on the computer, or can an Macbook Air handle it? Are all models fast enough for coding on the Mac?