Take a look at the suggested printers at linuxprinting.org: http://www.linuxprinting.org/suggested.html
I recently bought one of the low-end laser printers that they recommend (Lexmark Optra e312) and I've been very happy with it. -- Tom "No idea is so antiquated that it was not once modern; no idea is so modern that it will not someday be antiquated." -Ellen Glasgow