Cervelo P2C
This is my Time-Trial / Triathlon bike. It is carbon, and stiff in all the right directions. That stiffness in the driveline makes it incredibly efficient: all the torque I put on the cranks comes out the rear wheel with no wasted frame flex. But that same carbon layout lets it be slightly flexible in the vertical direction, so it absorbs road chatter and small bumps without pounding the rider. And fast... Oh, yeah, it's fast. If you want to get from point A to point B as efficiently and as fast as possible, this is a good way to do it!