Here's my "temporary" bluetooth solution until I decide on a more integrated solution. It's a BlueAnt Supertooth device I got for $70 a while ago. Very loud and clear. I have it velcroed it to the headliner. You push that mic in to turn it off. When my phone rings, I just push the mic to turn it on and it connects fast enough. Since I don't leave it on standby, the "15 hours" talk time lasted 8 months before I needed to recharge it. I obviously don't talk that much in the car.

 

I love mine. I clipped mine to the driver's side side visor. Not the windshield visor, but the one above the door's window The mic then shoots out toward the windshield.

works awesome