I just recently installed a MoDoo Plaza MHF-R220BT bluetooth handsfree car kit. I have to say that I'm extremely impressed. I paired it up with my 8700c and it works really well. When someone calls the phone number is displayed on the rear view mirror and read out to you. It also supports a great auto connect feature. Calls are clear and people can actually hear me. The speaker gets incredibly loud and the microphone can be conveniently placed on your visor. I highly suggest this item.

http://www.modooplaza.com/eng/products/220bt.htm

Am curious if you were you able to connect the mirror to a power source without exposed wires? (was the power cord long enough? or did you use another method such as direct connect to a power source in the car ceiling?)