I got a desktop charger off ebay that has a single USB port for the phone and the back has a charger plug and an output to go to headphones.

I would like something like this for my car. Preferably a cig lighter metal bendy arm thing that will charge it, but that also has an output for audio so I can run that to my aux input to my radio.

Anyone know of anything like this? Or of a cable that provides the USB to USB with Audio out and I can make my own?