GPS NAV question

got a new '06 jeep (non gps) and wondering if I should buy a used ebay factory (exact fit) mopar in dash "take out" that someone removed from theirs? - or are there better choices for "non" in dash units that I should consider?

these used ones usually dont have the cd or antennas, a problem?
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I just got a Tom Tom 700 for Xmas and have been really pleased with it so far . It doubles as a handfree kit for my Treo 750.