All seasons should be called "no seasons" because they aren't particularly good in any season. If you have a decent commute (which I would say you do) and can afford an extra set of rims (you can go super cheap steel rims if need be), get snow tires. They are so worth it. I personally wouldn't pay to have tires swapped out 2x a year on the same rims. When the snows are on, you aren't wearing out your regular tires and vice versa. You can always sell the 2nd set of wheels if you get rid of the car too.

For all the AWD and 4WD comments, it certainly does help you get going, but all cars are 4 wheel braking and handling. Just because you can get going with your AWD or 4WD doesn't mean you can stop or turn any better than 2wd vehicles. I see more people wreck because they get so overconfident in their vehicle because it is AWD/4WD.