I would like the 1M.
I drove a 135i m-sport for 4 years and it was just such a fun, powerful package. It was just unique. A true twin-turbo inline 6 with a 6MT and a rude little back-end that you could break whenever you felt the need.
The aesthetics for the 135i/M were also some of the best in the game; looked like a little World War II Nazi helmet. The car has such an aggressive, steroid fueled go-kart mentality about it.
Gobs of torque, a formidable bark with a proper exhaust setup, and weighing in at 3200lbs made for quite a thrill with power goodies added... Not to mention, e85