I know Garmin makes some in that price range. Love my Nuvi 660, but the price is a bit higher. Garmin seems to be the leader is routing you from the reports I have read, and that is what separates the companys who do the GPS thing.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K