I fitted a set of Cooper Weather Master ST2's in 205/65-15. These things are AWESOME. I was easily able to pass a Subaru on a snowy two lane highway this afternoon
The tread is pretty deep, so far I am very impressed for a cheap set of snows.
The lack of a LSD on slippery roads can be a very good thing. If you do break the rear end loose with power, and have a LSD, it will break sideways. Without, just one rear tire spins but the car keeps going straight. Just be aware that in inexperienced hands the LSD could easily cause loss of control, but the non LSD will just continue on.
Current ride... '13 GTI Wolfsburg
BMW's from my past...
'92 535i/5 '89 325ix/5
'98 750iL '86 325(e)/5
'95 740iL '84 318i/5