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IMO, you should primarily look for a device that has good reception, is accurate and recalculating fast if you drive wrong. It should also have a good map and upgrades comming regularely.
I own a Garmin nuvi 360 that I'm very happy with. It does all the above mentioned things. TomTom will also get the job done I guess.
I don't think you can go very wrong with either Garmin or TomTom, they're the top brands.
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