I bought a Garmin StreetPilot 2610 "like new" on eBay for $350 2 months ago. It works really well and is fairly intuitive to use. Here's a pic:
...It has a touch screen and a remote (you will use the remote a lot more than you think you will, especially with the H3 dashboard a good distance from you). It is very accurate and gives you a .5 mile and 500ft "countdown" to your next turn.
Do a search on "Streetpilot 2610 review" and you will get a good comparison to other units.
H3wannabe