Any developers chose the 13" pro over the 15" variants particularly for use as their main machine? I've lasted through college so far with my trusty ol' 15" Gateway windows computer and it has been sufficient for my programming needs in Java and other languages. Just one more semester to go . I'm about to purchase a macbook pro (my first Mac) which will see me off for this final semester. It'll definitely an upgrade to what I have now. I'm curious to see if the 13" pro meets the needs of those doing serious development work.