I'm looking at building up a new bike with the '08 Campagnolo Centaur gruppo, and I can't decide which crankset to go with. There is the model with carbon comp crankarms and one with the aluminum crankarms. Other than the weight savings with the carbon version (campa site claims 707g against 828g)and perhaps aesthetics, is there any reason to spend the extra $100 USD, approximately? Stiffness would be a concern with me, but I can't imagine the alu version being bad in that department. Would there be an appreciable difference with the carbon arms? The weight savings alone as an incentive isn't quite enough to make me spend the extra money, although its really close. I think I could stop eating pizza for a week instead.