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I use GPS units when travelling in the states, i have tried rental cars with them installed, and my own units, Garmin, and lately Magellan.

I would choose a magellan roadmate 760, it is very very easy to use, automatically calculates, and suggests a detour, if your stuck in traffic. It is the easiest unit i have tried, when it comes to what kind of roads / routes you want to go, it is a simple 3 choice thing, with highway, little use of highway, and no use. plus you can choose very simple between one of those, if you want fastest time, shortest route etc..

I would opt for a Magellan, thats the units they install in the Hertz rental cars, and developed togheter with them,

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