I have had great luck with the new Pioneer BT head units. All 3 I've tried (even the single DIN ones) sync with my N9 just fine. You can control the tracks and play/pause on the phone through the head unit, take calls with the MIC supplied by the head unit and the sound plays on the speakers. The unit even displays battery life and signal strength on the display.

I use this one on a daily basis
http://www.pioneerelectronics.com/PU...s/AVH-X8500BHS

I can sync all my contacts though the unit on the display to make calls by alphabet, and music works flawlessly with it. When you set the stereo to automatically connect BT, it will do just that and start playing the music right where it left off automatically the next time you get into the vehicle with your phone. It's all seamless. When you use GPS on the phone while connected and playing music the voice will softly interrupt the music to give you directions then get back to playing the music. The only thing it won't do is display artist/track/album data on the screen with bluetooth. I talked to eviljazz about getting bluetooth on the N9 to communicate this data and it may be a possibility. If that were to happen, I don't see any other need with connecting this device to the stereo except maybe to play video but this is a DVD receiver and it also has SD card slot you can load it for lots of movies and music as well. It is an overall good multimedia stereo.