I also have a CDR220. I installed the rear speakers from Harvey. Very easy and professionally put together setup. I have added the iPOD cable from Becker and have it hooked up to a new 16GB Nano. It sits under my park brake handle. It is accessable for changing settings with my thumb while driving. It is a great setup. I keep it in place with velcro. (no need for a changer). I have also purchased a Pyle Low Profile 8" powered sub. It will fit behind the passanger seat. I need to build a custom mount for it, but that will not be too much trouble. All in all I am very happy with my upgrades and I still have a stock look.
