I can't help you for your exact question, but I can tell you what I have done. This is my first winter with my car, but since I had the performance summer tires I decided to go with winter tires on my regular wheels. I got a full set for both front and back for about $850 for some Falken tires. Here in Colorado Springs we get three or four snows of around 6 to 8 inches a year and I feel I will be just fine with my new set up.

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2009 BMW Z4, red on black with aluminum trim, Sport Package, Cold Weather Package, Comfort Access, 6 speed manual.