I am looking to purchase a good GPS unit for my car. I would like a unit that will have audio directions, can allow to input multiple stops & can optimize a route with those stops.

Currenlty, Microsoft Streets & Trips works works well although using a laptop in the car is not exactly safe.

I have read a few reviews for some GPS systems, but many reviews conflict each other. Any suggestions?

my sister uses tomtom. she hasn't had a prob with it.