I have a PB12" too that could use a new battery (~$65) which may be available in the coming week (waiting for my MacBook pro to return from warranty repair). At the same time, I might sell the MacBook Pro instead, since the PB works just fine too

If Jakepunk keeps his, you can PM me for details.
I'd recommend a Powerbook above the iBook in any case -- better keyboard, and tougher construction.