If you love the disc brakes, but want more of a road style bike you may want to look into a cyclocross bike or a Kona Sutra touring bike (but this bike is a bit pricey). Both of these options will be a bit heavier than racing bike, but a bit more upright and comfortable for the long haul too.
They'll also give you options - can take a rack/fenders, wider tires for off roading, but will still be lighter and quicker than a mountain bike.