I am wanting to replace our family laptop which we use to drive the 27in thunderbolt display. We are not power users so we are open to purchasing a macbook air. My biggest concern is storage. We utilize 420gb of storage on our current macbook pro and we backup to an external 500gb hard drive. The only computer I don't want is a 13in macbook air. So I would want an 11in macbook air or a 15in macbook pro. I am guessing I will get about $700 to $800 when I sell my current computer. Thanks in advance.