After purchasing a killer pair of insulated rain pants at Cycle Gear, I installed the breath guard and chin curtain in my Shoei Quest helmet. All these are necessary winter accessories IMO. Plan to go back tomorrow and pick up a pair of glove liners while they are on sale.
Update: Returned the rain pants for refund and bought thermal shirt and thermal long johns, plus the glove liners. The thermals will be worn much more often than the rain pants would have.