Vitus 979. They made so many over such a long period of time (1979-early 90s?) and the models had few minor changes over that time. Not only were they raced at the highest levels, notably by Sean Kelly and his many victories, but they were also accessible to the masses. In my experience, it was hard to find a large group ride in the 80s without several Vitus riders. They were light, relatively affordable, and (subjectively) attractive with lots of different shades of anodized alum. My first race bike was a sky blue Vitus, so I'm biased.
