The Nokian A10s recommended by [MENTION=251447]ThermionicScott[/MENTION] seem like a good choice for the type of riding it seems like you will be doing. I used to think that studded tires were expensive and unnecessary until I got a set about 10 years ago. Now I think they are essential. FWIW I ride an early 90's rigid mountain bike with fenders and marathon winter tires from November/December to March/April in Chicago's north suburbs.