yea. discs offer more stopping power. and there is an advantage with a closed system rather than a v brake. also you will need to be replacing rims with v brakes. you can get lighter rims with discs, most disc rims are much lighter then their rim models.

and they did put discs on road bikes in red bull road rage. where they needed more stopping power. . .

with the price of some bb7s, i would go with discs.