What do you think? Should I sell my 15" PB 867mhz? It's been my primary machine for 6 years now, and I absolutely love it. But it's getting a little dated, and I need a bit more power for graduate school. Here are the possible situations: I can possibly sell my laptop for $400. I can get a brand new blackbook (albeit 2.16ghz - mid 2007), for $999. OR... I can get a brand new MBP (2.2ghz - current model), for $1699 (EDU pricing). OR... I can wait for new MBPs to come out (but doing this will mean the value of my PB will depreciate). But this may also mean the current MBPs would be on clearance. I'd like to know what some of you might do in this situation. THANKS for any input. HELP!