Recently installed a BP Montreal HU in my 240D. Got it from Crutchfield, for I think $99 after a rebate. More details in this thread:
New stereo install questions.
I selected it because I was trying to find a model that was basically black, and fit the cars interior, not easy to find in today’s market. It also came with a remote, I guess this is for changing sounds while "working" in the back seat????
Still on stock original speakers, which sound OK to me. I can listen to CD’s and news, what more do I need? It’s not like this car is a soundproof audiophile listening room!
Clay