I just got an iMac and now i'm looking for a good portable system to take with me on the go. Nothing too fancy, so I was looking at the old 12" Powerbook. why are they still so expensive on the aftermarket? with the release of the new Macbook and updates the to Macbook Pro line as well as the intel transition, I would have thought the price of a used Powerbook would have dropped well into the $500-$800 range. Is there a reason why they're still so expensive? are they particularly coveted?