Check out the Jamis Coda series. They are an excellent commuter and road bike. If you want you can easily mount fenders for wet weather and a rear rack to carry panniers or a backpack (for clothes, etc). We sold loads of them when I worked at a shop in Atlanta before I retired.

http://www.jamisbikes.com/usa/street.html -- Click the "Urban" tab to see all the Codas.