What to choose? Mac or PC?

[Matěj Hausenblas <matejh@pandora.be>]

Hello,
I have relatively old PC for today and when profiting of GNU/Linux 
multitasking, My computer gets slow (it's a Celeron 466MHz) and so I'm 
thinking of upgrading the hardware, by Motherboard&CPU upgrade and what goes 
with, or (and what I would prefer) buy brand new Computer and in this case it 
should be a notebook.
	Now I stand before a decision, what to buy, I've heard that the Macs are more 
powerfull and aren't so quickly obsolete as PC's, but I never touched a Mac 
and so if Debian is ported to Mac, it shouldn't be such a big step(?!) Also 
there's the difference in prices, PC is nowadays not expensive for quite a 
good performance, but in 6-12 months it wouldn't be so hot:-)
	So if someone who has experience with Mac Powerbook or Ibook could tell me, 
if there are some big problems (I heard of proprietary HW and Apple) or if 
everything seems be OK. Also I would like to know, if Ibook can be bought 
without MacOS or if it's like with PCs:'-(

Thanx
Matej