I curently have 06 centaur with a truvative crank. I want to get a regular (not a compact)Campy UT crank. What are the difference between Chorus Centaur Carbon and the alloy Veloce crank. I dont race so is it worth it to get the carbon crank or get an alloy crank. Is there a big difference between the Centaur carbon and the chorus crank?