I went with the JVC as it has dual USB's, one in the back and one in the front. I have the iPhone cradle plugged into the rear and the front is used for the Bluetooth module or anything else that I want. Cleaner looking that way.
The more I think about it the more I think I need that JVC. Is it the KD-A815? What is the bluetooth module, I though the bluetooth was built in on that one? You wanna trade for a Pioneer DEH-P6000UB?