Sport bikes are a combination of road racing bicycle and touring bicycle. They usually have a road racing frame with a triple crank, but with a more relaxed geometry. Don't go crazy, however, and hit those upper gears from the get-go (especially if you're planning on going up hills).
*Hit the lower gears—they are easy on the knees, and you'll be much more comfortable pedaling up hills if you live in a hilly area. And the relaxed geometry will enable you to take longer rides.