Hi Sohlman, First timer here!!
i will be picking up my New(to me) 2007 e90 320d with the basic stereo and have been researching the audio system side quite intensely, as I see you have. I'm really pleased to find your post here as the info is great from all parties involved and will be following it closely.
I'm no alien to car audio by any means, however new cars are integrating more in their own systems and was glad i have done the research before ripping the stereo out.
I wont be
at all. So good luck chief!!!