I am looking to get a Macbook Air to be a secondary machine to run CS5 when away from home. Mostly light Photoshop work, Illustrator, and some Dreamweaver. Any suggestions which model to purchase? I would like ultra portable, and am not sure if I would like the 11" or 13" model. I don't need a workhorse. Is the i5 the best option? (as opposed to a Core 2 Duo refurbished?)