I believe that in-dash 6 CD changers are for OEM vehicles. If you want a CD changer, you usually have to buy a separate unit that mounts elsewhere in the vehicle. Personally, CD changers are passe. They aren't needed anymore because of all the different media types. You can fit thousands of songs on a CD when they're in an MP3/WMA format. You can also hook up an iPod with tens of thousands of songs, etc. I don't think you can go wrong with a head unit from Alpine, Kenwood or Pioneer. They're high-end stuff is really nice but pretty expensive. They do have some cheaper models within their brand though. JVC has some nice head units that are affordable. If you're going to upgrade to a double din head unit, you might as well add one that is compatible with navigation for future consideration.