It is doubtful you will notice a performance difference between an Sworks frame or the Roubaix frame you currently ride. The wheel upgrade will show up right away, almost immediately, but losing 8oz in frame weight will likely never be felt or realized in time advantages. Frame stiffness is again up for debate. The wheels and tires flex before the frame flexes and is more quickly felt than flex in the frame. It is doubtful frame stiffness will show its face until the bike is put into a high stress environment. Example: High wattage sprints. 200 watts won't do it, 400-700 watts is the territory to be in for frame flex to become meaningful.

One comment on the Hover Bar. If a rider needs the added height of that bar, why not simply change the stem and save quite a ew bucks? Vanity?