Im currently doing all my development on a 2009 macbook pro 13in. The time has come for me to upgrade from this hunk of crap. I was planning on purchasing a 15in macbook pro (non retina) however the new macbook air seems like it could be a good fit. My only issue is on a 13in screen its a pain in the ass to work on iPad xibs. What do you guys develop on and what do you have any suggestions.