I realize that you're looking for an installed solution that will interface with the car's radio, etc. For me, after tons of aftermarket installs of stereo/gps gear (all great) I've settled on a very simple (though not elegant) solution.
I picked up a Blueant Supertooth Light. It simply clips onto my visor and will pair with a number of device (five, I think.) The incoming volume is superb and, depending on how noisy your car is, I've had no complaints about the outgoing audio either.
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