I will answer my own question so that others that might have the same question in the future will know-I purchased a used factory CD head unit with part number ending in 902, May 2003 manufacture date. It is iPod, Aux input, and Sirius capable. It does allow me to finally save Sirius radio station presets-plus, the overall operation of the Mediabridge functions is much faster and more responsive than with the older Blaupunkt manufactured head unit. The overall sound quality seems to be just slightly better also. Now the problem I have is that the display is much dimmer than the climate control and OBC displays. It doesn't affect the operation, but it is very annoying as the original head unit was perfect in this regard.
'04 330i ZHP
There are few things more expensive than a cheap BMW...