I am considering a wheel upgrade on my Roubaix elite. I am quite happy with the ALX295's as far as durability, stiffness, etc., but I know they are on the heavy side. I just don't know how heavy, and before laying down $400-800 on Spinergy's or Ksyrium's or something, I would like to know if the weight savings I will gain will be worth the money. Many thanks!