Get the Treo 650. Mine works perfectly with the old -552 BT module. All speed dial enties sync with the car. The Treo is also an incredible phone--call quality is amazingly clear! The 7100G is nice tho--I would have gotten it, but the Treo works better for me for a variety of reasons.

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-'13 E93 M3 Cab, Interlagos Blue, Carbon Black leather, DCT, all options, and fun, endless fun!
-'13 X5 35i M-Sport, Carbon Black & Cinnamon, Dinan Stage 2!
-'15 Toyota Sienna Limited Premium AWD, Silver & Grey, Nav & BluRay, and less lame than the 2011 it replaced
-'07 Mini Cab S, Laser Blue, 6sp, endless fun that ended (sold)
-'04 X5 4.4i, loaded, loved, modded and sold