I voted that I brave the cold...which is true for this year. I've committed to commuting all winter plus going on longer rides on the weekends. I will also likely throw in a spin class or two and I do other type of aerobic conditioning (step, kickboxing, treadmill, elliptical) to mix it up. (plus weight training)

Last year I stuck to spinning and the occasional trainer ride. I HATED the trainer though...HATED it. I'll take a 90 minute high intensity cardio video over a trainer any day.