[ez-1]

Go and ask your tire store for "Goodyear Ultra Grip Ice+", "Continental ContiViking-Contact 5" OR "Nokian Hakkapeliitta R"
All three are made for Scandinavian winter and will definitely enhance your grip on any kind of snow. Well not too much on bare ice but if you are not allowed to use spikes then these are your best shot. Also I would suggest to use same tires in every corner of the car but it might get a bit pricey for your needs. Actually if you have a rear wheel drive or 4WD then same tires to every corner. For FWD you might go with just front winter tires.
And Sab, generally it doesn't matter what car your driving, these tires will help you even if you were driving an old mini. Around here the only vehicles that don't change winter tires are heavy trucks and busses. I promise you that if you manage to get a pair of these tires you don't have to worry about snow any more. At least what comes to driving, it will still get to your supes and make them wet and uncomfortable when you wade through a snow bank
NOTE if you get a hold any of the tires above you should remember that your car will actually stop when braking but the next car wont!