FYI - I ended up buying the Belkin AirCast, which has a Bluetooth button with built in mic that you can mount on the dash. The power source and aux plug are out of sight in the armrest console. It paired easily with my galaxy nexus and so I can play my music and answer calls through the device. The sound quality is excellent for both music and phone calls. I think it has some sound cancelling feature because even though the call plays through the car's speakers, the person on the other line doesn't hear any echo.
My only complaint is that I can only pause the music with the device. You are supposed to be able to forward or play previous tracks by clicking the button a certain number of times but it seems this is an issue with Samsung phones.
http://www.belkin.com/IWCatProductPa...duct_Id=530115