I bought a new aluminum MacBook last week (the $1599 model) and have since started wishing I had bought the Pro, if only for the extra screen space and sound quality of the speakers. I figure that an extra $400 over $1600 wouldn't make that much difference in the long run. Does anyone have experience with exchanges at the Apple store? Another concern that I have is that I bought the MacBook with a student discount, which I'm not sure is reusable after an exchange. Advice???