Do you have any movement limitations? Lower back issues? Or leg mobility? Secteur is essentially an Alum. Roubaix and Allez is an Alum Tarmac. I can not ride a Tarmac comfortably for long distances, so I have a Roubaix SL2 and a Jamis Aurora touring bike. If you are not sure, go to a Specialized dealer that does BG Fit, go through the process and they will help you pick the right bike. By the way, Specialized has a very cool cross bike with disc brakes. If you change the tires to normal road tires, you will end up with a cool disc brake road bike.