If you ride year round you should have three things. A springsuit, fullsuit, and a heater top. I'd rather wear some kind of a suit and be comfortable. I always ride timid when I'm cold. if you can swing the $, I bought an oneill boot drysuit this year, and that thing was so warm all winter.
Also, I like to break a sweat before I ride and keep my body warm. You will see me and my crew in snowboard pants and a jackets before our sets when its 70-75 degrees outside. Helps prevent injuries and loosens your joints.