Audio question for scott(ML) Upgrade

Hello Scott:
I had a question regarding to a post that
you gave me for speaker upgrades for my ML 430. Basically the sound
in my ML sucks compared to my S320. I currently have a base radio,
cd changer, and factory speakers. Do you know of any nice aftermarket
decks and amplifiers that will work with the existing changer that I have?
I would like to upgrade the package, but still keep the changer if possible. Other Posters gave good input, and I was curious is you ever dealt with certain set-up's that sound nice. I would like to get close to the Mark Levinson (Lexus System). I am interested in having a minimum of 4 door speakers and a sub placed somewhere, possibly in the rear by the added amp. From a wiring standpoint, it would be great to have the added amp, and sub located near the current cd changer if possible.



Many thanks,