I was in the same position as you. I commuted on a Bianchi San jose, but wanted some gears. At the same time I wanted to keep the clean lines of a single speed. So seeing Sheldon Brown's set up and with the assistance of my LBS building a wheel, I came up with my own San JoGR8. Nexus premium band (8 speed) thrown onto my San Jose. Almost 200 miles so far and no problems.