What are your priorities? If you need good snow traction/handling (in
Michigan you really ought to consider a dedicated set of winter tires,
especially on a RWD car), have a look at Nokian WR (not available through
TireRack though). The only downside is that it's not meant to be driven
aggressively during summer, but otherwise it's fine. If you do like to
drive in a spirited manner during summer, yet still require some light snow
capabilities, consider Dunlop SP5000.
Have you checked Consumer's Reports? IIRC they recently had articles
on snow and all-season tires. Personally, I'm a Michelin snob, but
is an OEM supplier to BMW and the tires I had on my 330xi were ok, and
Continental also came across very well in the Car & Driver article on
performance tires so the ContiTouringContact is likely to be a good choice.
On the Michelin side, the PilotSport A/S would be ok for all-season.
But of course, you should really consider snows, since they will
be much better than any all-season stuff.
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