"Man Show" def has a good point. Always go as narrow as possible with snows. If you already have the wheels or just money to spend, the 16" setup will open up a world of more options for tires...ESP snows!
But IMO go with something cheaper for snows from Hankook or Sumitomo. Blizzaks are a great snow without a doubt, but when it comes to snows compounding and quality are on a totally different page than HP or UHP tires. A softer compound (cheaper tire) would typically give you accelerated tire wear for summer applications, but in the winter where days aren't hot it'll actually be more beneficial to have a softer compound which will actually allow for more flex in the tread pattern...thus allowing better traction in winter applications. But IMO save your money on the Blizzaks.
Brandon - 13' SWP WRX Sedan