After a good review from Macworld, Canon PIXMA MX850 seems like a good overall printer. It is more or less useable for small offices, but nevertheless, I think it would have been a great additional to my incoming MacBook Pro. Since it is compatible with Windows XP/Vista and Mac OS X Tiger/Leopard. The old Lexmark Z45 is only compatible with Windows XP, and I think Mac OS X Panther or something.
Not that I really need a new printer, but since I will become more active on the political-front. And with a good printer, you can create some nice flyers to publish.