The simple one
The Tomtom ONE ($399) features exceptionally detailed maps that include urban alleyways and many small country roads. Data entry is a breeze: The unit remembers recently visited cities. The display features useful statistics, such as mileage, arrival time and average speed. Satellite acquisition was speedy, and I had no signal problems. However, voice directions are rudimentary compared with the Nüvi and the TeleNav.
Bottom line: The Garmin Nüvi offers a great screen and many extras (it should, at that price), but I recommend the TomTom ONE for pure navigation.