a techie question re power book

A colleague of mine is selling a Powerbook for 450 pounds. Can anyone tell me whether this is a good deal? Or whether it is more worthwhile to save up and get an ibook?

Here are the specs:

The powerbook is  about 18 months old.  It has a 12inch screen,  
1.1Ghz G4 Power PC processor and 512 mb of RAM and a 40Gb harddrive.  
It has a Superdrive -  CD R and RW writer and DVD player.  It's ready  
for internet - either dial-up (via telephone line) or braodband (via  
ethernet port).  It  comes with a bag, an Apple optical mouse,  
adaptor to link to a data projects for showing slides etc.  All I  
need to do to make it ready is do a clean reinstall of the operating  
system to remove all my old programmes, documents etc and put it back  
to its original state.  I'll install for you the latest MacOSX 10.4
(Tiger), iLife (which includes iTunes, iMovie, IPhoto) and iWork  
(which includes a DTP programme called Pages and an excellent slide  
and presentation programme called Keynote).

happy birthday, calico!

* * *A very belated but heartfelt happy birthday to dearest ukcalico!!!* * *

happy birthday, gloria

* * *A belated but very happy birthday to viva_gloria!!!* * *

happy birthday, becca ming!

* * *A belated but very happy birthday to the talented _ming!!!* * *

happy birthday, blythely!

* * *A very happy birthday to blythely* * *

I'm actually early for this one!

May the next three decades be as gloriously decadent as the last three have been!