I have a new unopened MacBook and a 15" G4 PowerBook. Would you sell these two and put down $500 or so for a MacBook Pro, or would you just keep them and your money?
I have a linux pentium D desktop as well if that matters.
Agree with selling the powerbook, and keeping the macbook. Use some of the money to buy a nice lcd, and you'll have a nice laptop with good screen real estate when you need it.