I got the Delphi unit, so that I could take it into the house, or wherever (like the hotel I am in right now, with the home kit) and I got a deck that has an aux input on the front. However, I am going to buy an adapter to allow the aux input on the back of the unit. I didn't want to do the FM modulator, because that reduces the near digital quality sound to the quality of the FM transmission.
Circuit City fashioned (and painted) a bracket that would allow it to mount between the stereo and the glove box. I will take pics and upload them today.