Hwelvaar, what an agony!
Deciding between these options!? Well I guess that irrespective your choice, you'll end up with a magnificent ride.
Seen your report, I don't see you're going to incline to the AT with your heart, maybe with your mind. But this car is mainly passion, not ration. My 50 cents advice: Just go for MT sdrive and put the money in some decent winter rims/tires.
In case of this M135i dilemma, I'd follow my heart also. For my 320d and 520d that I consume in a timespan of 3 years, I follow predominantly my brain.