I am looking at replacing my specialized epic with a Giant Anthem X. The best value would be to buy an X2, sell all the parts and use my epic parts to build it up, but I am concerned with the RP3 shock. If I buy the frame only for $1600 I get the RP23, but that is considerably more dough. After being used to my epic I am looking for the most efficient bike possible. Does any one know how much propedal the RP3 has on its only setting compared to the RP23. I am hoping that it compares to the highest setting on the RP23. Is the RP23 worth the extra dough?