thanks for all the suggestions/answers..
Tom, since the link above to what I would need had links in it that seem to be outdated, can you please tell me exactly what I would need for this to work? I found the link to the Dietz 1260, but not the cradle and anything else.. Also, how hard is it to install myself? I've done some car audio installs in the past, but on fords and hondas, nothing as nice as a BMW.