With the new 13" Macbook Pro with Retina display, the price gap between this one and the 13" Air seems rather small. So why would you go for a Mac Air when there probably won't be any noticable weight differences between the two, and the Pro will be more powerful? I'm planning to either get this new 13" with Retina or a 13" Air. I think the price for the Air line could drop. What do you guys think? Wait a while before getting a Mac Air?