Unfortunately there don't appear to be a lot of choices for in-dash cd changers. The following are what I'm aware of...

Nakamichi MB75 In dash 5 disk changer / AM/FM receiver
www.nakamichi.com

Alpine 3DE-7887 In dash 3 disk changer / Am/FM receiver
www.alpine1.com

Blaupunkt IDCA09 In dash 5 disk changer only (standard DIN size, will mount in dash, but has to feed a seperate receiver).
www.blaupunktusa.com

I recently went with an indash single cd player (Blaupunkt Munchen) and I'm happy with it. Suffers some of the same ills as other radios I've read about - LED difficult to read in full daylight, a little flashy for the Benz (but not as bad as others), but a heads and shoulders improvement over my old (89 300E) stock becker unit.

Good luck with your search.