Figure out what one or two items ended my riding season last year and pick up whatever I need to fix those problems. Every year I've been able to keep riding another 5ºF colder and wetter. Once the weather has finally knocked me off the bike, I'll leave the rest my cycling budget in the bank until Spring.
This year it will be Power Grip pedals so I can wear my winter boots without feeling quite so "unclipped" and a pair of lightly tinted goggles. I'm not sure the goggles will deal with the fogging any better but I need to pick some up for skiing anyway so I might as well try them before investing in a face shield.