http://www.amazon.ca/iClever-Bluetoo.../dp/B00KRZ23J4
This is the one I'm using - it's excellent. Plugs into the AUX. Connects quickly when you start the car, and it's got integrated controls and a mic right on the main body - it comes with a little 3M-backed magnet, which you stick somewhere, and it sticks to. I put it just behind the steering-wheel, on the right hand side. Just under and to the right of the ignition, if you will.
Can't recommend it enough!