Yeah, go with Johns stuff. I gave up winter hiking shortly after I found out I had diabetes. I thought my feet were damaged from freezing, nope... Anyway, the school has good recommendations, though not the lightest...in winter, weight is a distant second place to function, though. I believe they recommend a -20 bag, white gas stove and 4 season tent, minimally. LOTS of extra cloths...days can make the snow "rain" on you with 4-6" wet snow balls.
It is really nice in the winter...you WILL enjoy it.