Couple of notes when shopping Kenwood. Obviously, make sure it has the cd changer controls. After that I highly recommend getting one with a two line display. With a two line display you can view playlist name as well as track title and artist. With a Kenwood single line display you are usually limited to either playlist or filename, not both. I have a single line display in one car and while filename is alright, because I display artist in the filename, I've been frustrated not seeing the playlist from time to time.
Other than that, what A543 said is right on. I have a VW box running off a Kenwood head unit in my daily driver.