I am very close to pulling the trigger on a new Mac but just have a couple final questions. Ignoring price and size and focusing strictly on performance I'm trying to determine whether the 13 or 15 inch is the right model for me. I plan on using my computer for some web browsing, office type work, web development (so light image editing) and personal audio recording (so just a couple tracks in Pro Tools or something similar). I do not do any video work, intensive audio production or gaming. I'm worried that the 15-inch model is overkill for my needs but don't want to wind up with the 13-inch only to discover it doesn't have the horsepower to get the job done. So which one should I go for?