iPhone integration kit with bluetooth headset

[kbond]

I have been looking for days for a way to mount my iPhone in my car (08 mazda3 sport). I bought this belkin lighter mount and I don't like it at all. I have to plug in the phone to the power then the 3.5mm input into the stereos aux. The cords all over my dash looks like crap and there is a buzz because of the ground loop problem (I know I could get a filter to fix this).

I am thinking about getting an integration kit for the car stereo - this way I have only 1 cord to plug in and can control the music from with the car's stereo. Anyone had problems with this approach? Suggestions?

With the integration - how will talking on my bluetooth headset work? Will it know to switch to the headset and dim the music when a call comes in?

Thanks,
Kevin