Yeah, I've been doing a little more research and it appears that BMW does make something like what I'm looking for (it's an iPod integration kit which BMW says should go in the glovebox - of course, I wouldn't put it there). However, just about everyone I've spoken to has actually told me that it is not a good solution and to go with an aftermarket unit instead. I'm going to look into the DICE and also check to see if BSW offers a solution.