Continental DWS 06's; the OEM PZero's are currently residing in my garage. Personally, I like the ride of the DWS and we'll see how they do both from a life POV and in snow/ice. I usually deal with 2-4 snow "events" in a year, up to 6-8" of snow so full on snow/ice tires are probably overkill.
purchased the spare here..
http://www.bimmerzone.com/BMW_Perfor...T-E70-KIT.html
the snow brush you see with the spare was purchased at Amazon; the brush head swivels and the ice scraper is the best I've found in over 40 years of driving..
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Finally, the OEM BMW cross bars were found on eBay from the BMW Morristown ebay store (significant savings) and the Yakima rack is a "load warrior" i've had for several years, I have a Yakima bag that sits inside the rack to hold "stuff"
Ready for Winter travels