Well after a lengthy search on the web I found what I needed.
USASPEC PA12-TOY (it is a brand new model)
http://www.discountcarstereo.com/detail.aspx?ID=1022
Had it installed today and it works perfectly with my factory in-dash 6 CD changer Model A51817.
It has 2 modes: direct and playlist. TBH, the playlist mode seems a little hokey so I chose direct which is fine by me as I was used to controlling everything from the iPod anyway. That said, you can use the Track button on the changer to move through the iPod if you like AND I still have access to CD changer where I can use CD 1 thru 4 (when I buy new music and want to listen on the way home before loading it in the iPod). CD 5 is the iPod and CD 6 is an AUX port. The iPod continually gets charged and volume, bass, etc.. are controlled from the changer so I don't have to fiddle with the volume on the iPod click wheel - in fact I think the clickwheel volume is disabled while you are plugged in to the adapter.
The sound is awesome!
Ran the wire under the rug to that little cubby in front of the arm rest so it is very clean looking; no visible wires.
Yes, it is a little pricey I guess but I really didn't want to change out the factory HU in a brand new car - maybe someday.
Cheers all!
MJC
2007 Matrix XR 921 miles