Was about the same amount down.... maybe a litte more, 36month @ 12k/year, car MSRP was $2000 more than yours and I'm $774/month. This was with holiday cash, bmw loyalty discount, and bmw drive app discount.
BTW, I came from a 335 (2010 msport) as well and man what a difference. They may look alike, but the M3 is a beast and feels like a completely different car. I'm also a manual guy, but loven the DCT so far.