valiar said:Easy. PowerBook.
I have compared (unscientifically, I admit) performance of MS Office on 12' Powerbook and on an MBP in my local Apple store. 12' was about *twice* as fast.
Right now, pretty much nothing, except Apple's own apps, is Universal, so your MS Office (you plan to use it a lot, right?), Adobe apps, and a lot of other things are going to be noticeably slow.
So you will be living with rather dismal performance for almost half of typical laptop upgrade cycle time (2-2.5 years!). If you go with Powerbook, you will have *acceptable* performance during the whole upgrade cycle.
I disagree with 2 things here. First, every benchmark I've seen suggests that a 1.5 Ghz G4 would not even come close to being twice as fast as a MBP running office. They should be about equal, with the G4 maybe a bit ahead. Second, I think the upgrades will be out sooner that that. It may be 2007 for adobe's CS, but office will probably be this year. I'd bet it'll be ~6 months or a bit more until we see a UB for office.