Guys, I have an old MacBook 5,1 that I will sell soon. To replace it I'm wondering if I shall go with the new Air 13 or the new Pro 13. I have an iPad 3 already, so portability isn't a big issue... Is the Pro 13 much more powerful than the Air 13? What about battery life, big differences? And the screens, I saw that the Air has a bigger resolution. What would make you guys choose one over another? Thanks a lot for all the feedback!