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Have you considered a portable unit?
I have a Navman iCN 635 that mounts nicely in the tray above the radio. Although the antenna is built-in, I bought there small exterior one. Sits on the roof in back with the XM antenna.
The advantages are that these companies sell to the masses so they are cheaper, portable, and easy to update. They all come with a USB interface so they are easy to update.
Their is also an iCN 510 that is very slick and appears user friendly. Just less internal memory.
I got mine at Newegg.com for under $600.00.
Don't even consider TomTom as you can't program a cross-country trip.
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