I live in Chicago. Had to ditch the IS-F for an Audi S5. I really do miss the IS-F in many aspects, but the S5 in terms of daily driving and "performance when you NEED it" is much more reasonable. I've got the S5 with the stock tires on now and have had no problem on icy roads, and it's been through two blizzards and handles well even with moderate/hard acceleration.
Come summer time, I'm going to miss it though.