Here is my dilemma. I have an alloy Synapse from Cannondale that is 2 years old. I am just coming off of my second neck surgery and I am slowly getting back into riding. I want the most efficient Synapse that I can afford. So does that mean that I upgrade to the SL carbon frame and use my old components or keep the alloy frame and upgrade to better components? Will I see an increase in speed just by changing frames? I would go from a 60 to a 58. I feel that the 60 is somewhat oversize for me.