Skinny tires would actually be better in the snow. Get some pizza cutters for your 6.The smallest rim you will be able to put on will be 17s, the MS6 rotors measure 12.6 inches in front, 12.4 inches in back. Your rotors are about 0.8 and 1.0 to big for 16s. The non MS6 have rotors measuring 11.8 in front and 11.0 in the rear. Get some 17s and go with a wider tire if possible.
Which performance winter tires will you get. I may have to get some and have not begun to shop.I am going with a winter tire that is more performance oriented and still has the speed capability I will need for highspeed driving.