Having fairly recently aquired a trek 1.5, after seriously considering a 1.1 I think you will really enjoy it, especially if you plan on recreational riding too - I found the difference between it and my old mtb, well, astonishing! I wouldn't forgo it for the sake of riding to and from campus, though I would highly recommend using your mtb for this if you still have it. Believe me when I say that wondering if your nice road bike is ok all day, while it's locked up in the crappy school racks where any potential thief or general cock has access to it is something you'll tire of quickly. Besides, if you commute on the old bike, you'll enjoy the road bike all the more when you do ride it