Use a bike from a charity store for winter commuting, as the salt wont be kind to your JTS. Panaracer Pasela TG foldable gives a nice ride and has kevlar belt, but wait till your current ones are wearing out. Put a rack on the bike and carry tools, lunch etc in a trunk bag. Leave the lock at work. If you commute on roads with lights, a couple of $ store LED flashlights fixed to the bars with elastics will be sufficient + blinkies.