I'm considering either a 2.2ghz macbook white or a macbook air base model. With the educational discount I'm looking at 1199 for the macbook and 1699 for the macbook air. I know the air is more expensive but I'm trying to figure out what the residual value of each computer would be in a year, when I will most likely upgrade. Anyone have ideas of what the computers would be worth in a year if I kept them in mint condition? If they both lose the same value or close, I think I'll spring for the macbook air. Any thoughts? PS. I would not be using either of these machines for power really, but if I went for the macbook I'd at least want a superdrive, thats the only reason I'd get the 2.2ghz rather then the base model.