I know, I know. Mercedes parts on a BMW is blasphemy, but these are very generic looking, so it doesn't bother me.
I wanted paddle shifters. SMG and SSG paddles were going to involve much more cutting than I was comfortable with, so I had to find another route. After some researching, I came across the Mercedes AMG paddle shifters, reasonably priced around $100. They required minimal cutting, were a nice, heavy aluminum, and would wire up just like SMG paddles. I'm very happy with the results. The paddles, slip ring, and parts for the wiring harness, came to about $260 after shipping from ECS. I haven't had a chance to utilize them much since I just installed them today, but everything works well.