I just don't see buying an adpater for $70 and a headset for $100. For not too much more, I can have a 7290 with BT built in, double the memory and multi-stage backlight.
I guess the question would be if bluetooth functionality is worth getting an upgraded BB for. I personally agree that you would be better of getting a BB with bluetooth built in as opposed to shelling out the $70 for the adapter.
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Now you can call me STORMin' Norman, except my name isn't Norman.
I got the Motorola HS850. Works like a charm. Also have the M3000. As far as the HS850 goes. No echo. Good sound. Good range. Nice appearance. Very comfortable. Goes well with the 7290.