Not to try to convince you to get something different, but FWIW there are more differences in the MBP and MBA lineup than just CPU and GPU. For me, the two majo

Not to try to convince you to get something different, but FWIW there are more differences in the MBP and MBA lineup than just CPU and GPU. For me, the two major factors were RAM amount (couldn't get 16 GB's with anything but MBP 15" at the time), and ability to hook up multiple external displays. My current setup is the laptop screen + two external displays. At least as of a year ago MBA's and 13" MBP's could do this. At best, you could drive two external displays with a 13" MBP (but not its own screen). USB video cards are a solution, but consider that they drive CPU usage through the roof unless you are staring at a very static screen. I used to use one of these to display my terminal. Then one day I put the browser on this screen and was checking GMail when I heard my laptop basically lift off the desk from the heat and speed of the fans.