what do you want a cd changer for? im not trying to crack on you but dude if your thinking well i dont want to have to change cds all the time well 6 cds isnt much and then when you want some new ones it will be a huge pain to switch them when its under the seat. this is what i recomend get a deck that plays mp3s you can put a lot of cds on one plus its easy to switch when your tired of it and it will give you track info.
www.audiomyth.com they have some pretty good deals comparable to a cd changer im sure.