I'd recommend Garmin like all the other fellas here as well. I cover the northern half of Cali for my job, on the road all the time, and my Nuvi 200 has been everything I need and more for the last year. It's got accurate maps pre-loaded (with the ability to update) and I like the extra features like being able to quickly search for hotel, restaurant, gas, etc...
I've also noticed a lot of the newer models are coming out with widescreen. I am lost on why this is a real advantage - are people watching hi-def movies on these things or what? I understand the advantage of a bigger screen to see more map, but why not make them bigger all around?

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2006 Smoke XE 2WD KC
Lucky Seahawks Mirror Ball
Sirius Satellite Radio
Garmin Nuvi 200
17" ATX Predator Teflon wheels
Ultraliner spray-on bedliner
Bakflip G2 bed cover