I have made up my mind on purchasing a carbon frame to upgrade. My question now is which of these 2 frames/bikes will suit my needs. I am looking for a lively responsive frame that will allow me to sit in a more upright position. A frame that is stiff and not too flexible.

Any ideas on which one of these 2 frames fit the bill? The S-Works Roubaix looks nice but Cannondale has a reputation for having stiff frames.