Trev,
May I offer a little glimmer of hope for a one tire solution. Have your all season tires siped by a tire store. As I recall, Discount Tire (primarily a southern chain) used to offer siping as an option for their tire sales. It is a compromise between All-Season & Snow Tires: better traction than all season and better wear than snow tires. If you look around, you might find a local dealer that sipes tires. I have a rear wheel drive car, with all-season sport tires(235/50-17 & 250hp) and it is just terrible in the snow. The current OEM tires are candidates wear warranty replacement, so I'm not touching them for another 10K miles. Maybe, I'll get a new set for free. The next set of tires will be siped, and hopefully, I'll be able to get up my driveway like my wife and her front-wheel drive car.