Really interesting thread, credit to the OP for such an excellent post.
I had coils on my 335i and definitely feel like my M3 could use a drop in the looks department. However, I'm loathed to mess with the suspension - I feel like the handling is awesome and just don't want to disrupt it. I was thinking about Eibachs but this thread (and a few others) are definitely pushing me towards staying stock.
2010 E92 M3 || Akrapovic Slip-on | MS Air Filter | MS 15/12 Spacers | V1 Hardwire