There have been a lot of great GPS deals lately - these things are getting cheaper all the time. You might want to get a portable GPS unit with the Garmin name, though. These have been around and have a great reputation for reliability and accuracy. This Garmin c340 also has text-to-speech and that is well worth the money! Not that it's that much more, Buy.com has it for the best price right now!
GARMIN STREETPILOT C340 PORTABLE GPS SYSTEM SALE