Winter wheels and tires for 2013 m sport rear drive recommedations

Thinking about winter package. Should I go pirelli with run flats, or Michelin pilot alpin pa3's, non run flats.
Also considering breyton gts-r wheels or avant garde m310 wheels.
Another option is a five spoke BMW wheels with Pirelli run flat winter tires sold by the BMW
Dealer.
I'm less concerned about cost vs looks and ride comfort. Any opinions or experience with the above products would be appreciated

I'd recommend that you stay away from RFT. They're bouncy, not very comfortable, noisy, not great for performance, and are nearly double the price. Go with any non RFT option and it will be a significant upgrade. Are you looking for an 18" or 19" option? I'll shoot you over a pm with more details!

Generally speaking smaller/narrower is better for winter wheels & tires, provided of course that the wheels clear the brakes.

I just installed Nokian WR G2 (non RFT) performance winter tires on my stock 18" m sport wheels. aside being slightly louder than the summers, performance is smooth and controlled. They really perform well under 40 F. Waiting for some snow to give them a real test. Everyone I've asked about performance winter tires has recommended Nokian (either Hekkapellita R or WR G2)

fyi - 17" wheels will fit your car just fine.