Bluetooth audio transmission module needed


I am looking for suggestions for a Bluetooth module for transmission of line level in audio dual channel. Need something simple that will automatically connect to a car radio like a cell phone does.
Something that can be controlled with Arduino code. Any help would be appreciated. There is a lot out there but I'd hate to buy a bunch of different ones for testing. Maybe someone has found one that works good.

The USB host code currently doesn't have support for isochronous transfers, required for audio.
What about using some of the Bluetooth audio boards/modules.....BC127 or RN52.....etc
Most of these work on I2S or analog audio and controlled via serial port and Bluetooth to portable bluetooth speakers etc