Last year I went with a Garmin Streetpilot 2730. Bought from Costco online. We are really happy with it. You can subscribe to satallite radio which also gives you traffic and reroutes around traffic. The accuracy has been good and I love the punch in screen (wouldn’t ever by a model that didn’t have this).
On another note, when shopping for this I looked to see if their were mobile phones with this capability yet, and didn’t find anything. Now verizon and others have GPS enabled phones….just something to think about…