Since I was looking at the Shimano pedals, do you guys think it's worth the money to buy the Ultegra pedals $113) or the Ultegra carbon pedals ($174) instead of the 105s ($65)? I know it's all about rotational weight, but... Thanks.

http://www.amazon.com/Shimano-Carbon...5629941&sr=1-3

http://www.amazon.com/Shimano-PD-670...5630046&sr=1-1