I currently own a MBP i7 I am contemplating a MBA as a second ultra portable. I will use it primarily for basic functions - word processing, internet, some pictures, some video. Anything requiring storage or power will be the MBP. the 11" seems rather attractive, however, for less than $100 - the 13" offers significant upgrades - but larger size (either way getting 128GB). Looking for advice - this is a tough decision.