What kind of shape is your iBook in? Reason why is that just 2 weeks ago our little girl's iBook succumbed to a fried logic board. She also needed a new keyboard, the hinge was breaking and the case at the bottom of her lcd was pulling away and had a huge gap.
Rather than buy a new Mac (we knew this iBook was being passed down to a sibling in the Fall for the school laptop program), we opted to get *everything* repaired under Apple's flat rate repair program. For a flat rate of $280 plus tax, they repaired everything which needed to be done. She's very happy with her 'like new' iBook that had just gone out of AppleCare, and we're pleased these repairs have a 90 day warranty on them.
Just something to consider. Of course, the other choice is to put that money towards a new MacBook, which also makes good sense.