With all this discussion on rolling resistance, I have to ask: What is the goal in a commute? You're probably just trying to get somewhere (like work), and carry some things along the way.

So ideally you want your tire to be tough and reliable, and handle whatever road conditions you have to face along the way. For me, bigger tires are a no-brainer; I can roll over anything in my way and get to work in reasonable comfort. Weight is also not a concern; what's an extra 3lb pair of tires when your panniers already have 15lbs of stuff?