Probably studded tires is all you need for winter. I don't know how winter is there were you live. But where I live a cheap bike is best for winter. I would dislike having invest lot of money in a bike that will get eaten up by all the salt the city maintenance drop on the roads. Plus fat do well on packed snow. You won't be able to ride on more than few inches. And if it is icy you still will slide and fell off, also consider how hilly your area is. It will make you work harder going up hill. Remember more wide tires means slower ride.