I played around with a Sony unit that had bluetooth built in from Parts Plus, and I could control the music off of my phone and all and receive calls... It was awesome..
But I wouldnt ever buy a sony product.. I traded an old piece of junk mp3 128mb player for a 1200w Sony Xplod amp (the guy was dumb)... But the amp is junk cause sony advertises peak, not rms, but it was still practically free and I still use it.
The headunit I have is a JVC, and like I said I'm in the JVC crowd now, just cause I have Sirius too, and it's a JVC product that runs via the JVC-cables.
I've got the JVC KD-LH910, it's a 2005 model and bluetooth wasnt that common then... But the headunit rocks, I love it, just wish I had bluetooth.