I have the Garmin Nuvi 350 and I highly recommend it. In fact, I have no idea how I got around before I got this thing. I did a lot of research before the purchase and bought the 350, based on the multitude of reviews I read.
Have a great trip and I hope you continue to participate in the forum.
GMTA...I own a Nuvi 350 and love it as well.
Oh, and one tip - use the suction cup and attach it on the windshield just below your rear view mirror. I started out thinking I wanted it down lower near my stick shift and found that was very dangerous, as it requires taking your eyes off driving too much.