Aluminum bars are more shock resistant than CF. Both are built way strong enough so that the added fatigue resistance of CF doesn't matter. Today while working on my Madone, I weighed the carbon bar and stem with an equal size aluminum Cannondale stem and FSA bar and was rather surprised to find out they weighed exactly the same. Then I discovered a narrower specialized bar and it was 40 grams lighter. This makes the Aluminum bar and stem lighter than the integrated carbon bar I ordered. So you might want to think on that. Though the specialize bar has no internal runs I'm sure that they're available. And I find aluminum bars a great deal more comfortable than the oddly shaped carbon stuff on the market that is all made in China anyway.