Kinda depends on what your average drive will be. If you're actually driving over snow and ice frequently, the narrower the better because it puts the weight over a smaller contact patch and you get better "bite" from the higher pressure.
Conversely, if you (like me in Pittsburgh) rarely drive over much snow, and are primarily driving on salted/cindered roads that are actually dry, you can afford to get a wider tire. I have run as wide as 235 snows (for two years) and had no issues. If I lived where they didnt salt and only plowed (Jackson, WY comes to mind) then I'd be running on 195 tires.
Skinny tires do look goofy, and you probably can't go narrower than 205 or maybe even 215 on the stock wheels. One benefit is that skinny tires and wheels pull the outer edge of the tire well into the fenderwell, so you dont get so much shit spraying up on to the side of your car.
Rim size... well, the smaller, the plusher the ride when you hit potholes, etc. I think most people use the stock wheels with 225 tires. I would have done this, except I use the stock wheels for track tires, and I had free 15" steelies... so I have 205 snows on 15" steelies. Dry weather handling suffers some from the sidewall roll, but then again, most of us arent pushing all that hard in the bends during winter... but Ive certainly drifted through corners when they are heavy on salt/grit with no adverse affects from the tall walls.
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