So long as you have the data cable (the big, thick, black cable) you can do this. HOWEVER, I suggest you bring the data cable with you when you go to buy the head unit. Some Sony's have different bus connectors. There are 2 different ones: a 9 pin small connector (like a computer keyboard), or a large circular plug with a rectangular inner connector.

Power is sent through the data cable. When using the RF remote, the RF box is connected to your car's power and it sends power through the data cable. Same concept with a head unit, so no need to worry about running power to the changer itself.

One more thing. Using a head unit will make the changer sound better..... since RF uses FM radio, it has a 17khz ceiling (for the carrier frequency). Connecting it through the head unit will give you FULL badwith (20hz-20khz):bigok: