IMHO, get a cheap bike for the commute...less than $300. You don't want to lock a $1200 bike up on campus because it will get stolen. If it were me, I would use the bike you already have for the commute because there is less chance it will be a target for theft, and it will be a good workout for you. You could even put slick tires on it to make the ride a little easier. Then spend $1200 on a road bike you want to use for real riding.