Just another advocate of winter tires. Lived in Portland for 20yrs and had a set up there. AMAZING how well they work.
To all those "careful" drivers who think they can get by on the summer tires, you've been pretty lucky so far. Yes, getting going is pretty easy on summer tires but there is no all-wheel stop. I don't care how "careful" you think you are, there will come a time those summers just aren't going to get you stopped in time....I learned through experience.