got a 6000 series pioneer, and i love it, it really woke the speaker/stereo system up, and didn't have to do anything but get the right wiring harness and cut/solder a few wires together, then it all clipped right into place.
I think Pioneer makes a Double DIN 6-disc changer if you want to keep that option, but do like i did and just burn a few mp3 CD's and you have 1500 songs on nine discs and NEVER run out of music!!!
good luck with whatever you get!!
shaun