If your in college i would reccomend the 17" pwoerbook, although many people consider this too large for a laptop, its extremely beautiful (get it with education discount and it will be a bit cheaper)
On the other hand the G5 (which is what im getting) is "faster than a speeding bullet." If you really need the power, and the g5 has LOTS of it....the go ahead and get it. Mind you it wount be nearly as portable as the laptop nor as sexy in my opinion. But the deciding factor for me was....the G5 is so so so much faster than the g4 (167 mhz bus vs 1ghz bus) i choose g5. Its not even a question in my head
well i wish you the best of luck with your decision and computer buying experience. 🙂