YOU NEED WINTER TIRES!!!
Do NOT use our stock tires for winter, plus the road salt is MURDER on alloy wheels.
Personnaly I use 14" steel rims with Yokohama Guardex 720 in 185-65-14 and I'm really satisfied since I drive mostly on highways. This tire is fabulous on cleared icy/slippery roads, but it ain't good on snow below 50km/h (lacks a bit of grip), gets better at higher speeds (tread evacuates the snow only once the right speed is achieved). A 4 season tire is a BAD choice in any situation, a pure snow tire is not effective on ice and the opposite for an ice tire. The Guardex 720 is the best winter tire I've owned in the past 20 years/winters, the Guardex 600 has weak sidewalls so handling is not fantastic. I have friends who own the Michelin Alpin and say it is also pretty good. FORGET the Bridgestone Blizzak because it wears out in less than 20000km.
It's up to you anyway, just wanted to help a little.