my ultegra brakes on my roadie give me as much if not more condfidence than the discs on my mtb. high end shimano brakes work nice. team them up with some nice cane creek non shifty brake levers and your set.

of course if you want to buy a new roadie that could work too! ride the road bike most days (or just when your tired) and work in the fixed gear a couple times a week. a road bike is just nice to have and opens a whole world of riding opportunities you just don't have with a singlespeed or fixed gear.