A few months back, I bought the garmin nuvi 3490. Its pretty expensive but if you use it fairly often, you'll be glad to have spent the coin. It is thin and fairly lightweight, you can carry it in your pocket. It can be used outside your vehicle and the screen is new tech meaning its smaller but still, very clear. Best yet, from the 6 months that I have been using it, I have never had a problem with the nav. It takes me where I want to go and I've never had any issues with the sometime "roundabout" routes. It has voice command and a lot of other features. The maps and software are updated fairly often.
I would highly recommend it.
