I use my road bike. It's not anything fancy (a 2005 Giant OCR1). I'm lucky that I can take it in my classroom and not have to leave it locked outside all alone. I'd be nervous taking a brand new bike and leaving it locked outside all day. Maybe you could snag an old steel frame or older aluminum bike on craigslist or eBay and use that as your commuter.
BUT... this advice is coming from someone who doesn't trust people to not mess with my things. I'm protective of my toys.



				
				
				
					
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 It seems like it weighs a ton. I haul it up a flight of stairs everyday to keep it safe and sound with me. It's also my errand bike that I do lock up outside and unattended from time to time. It replaces my fast, fancy and expensive road bike which I rarely let out of sight when I'm riding it. I have even been known to take it into the bathroom with me! 
  bikerHen
  The snow is starting to be measured in feet, not inches, for the first time in at least three years. 
				
				