You have to talk my recommendation with a grain of salt, since we barely get rain in my part of the country, much less snow - but, I don't think you could go wrong using a cross bike as a commuter. They are light, quick, but much more durable than your standard road bike. While I don't think I'll be jumping too many curbs on my Specialized Tricross Comp, it can handle the potholes, cracked asphalt, and other adventures that the street throws at you with no problems.

My bike came standard with 32 mm tires, and I believe you can go up to 38 mm. Also, many cross bikes are now coming with rack and fender mounts which makes them ideal for commuting or touring. Good luck, and let us know what you decide!!