So you want a fat tire dual sport bike you can take to the trails, or you want a light fast carbon fiber road bike with flat bars. Two completely different types of bikes. Frankly, neither makes much sense for what you want to do. While I understand there are people who prefer road bikes with flat bars, why do you? If you want a cf road bike for fast weekend road rides, I would consider a bike with drop bars like Trek Domane, Cannondale Synapse, or Giant Defy.

You want something rugged and versatile? Consider the Surly Troll, Salsa Vaya, or Cannondale Bad Boy. Want an all rounder? Giant Escape, Jamis Coda, or Trek Fx 7.2 or 7.3.