I have a question about CAAD aluminum VS Carbon frame bikes...I am a newbie yes...Is it safe to say that you can presume that a CAAD 8 or 10 frame is light enough and sturdy enough to be a better choice than a carbon frame bike...My CAAD8 is the least expensive i could get with the 2300 groupset but for me as a noobie it is a REALLY nice bike, i know i will want to upgrade eventually Maybe even the Synapse perhaps but i was actually looking at maybe the CAAD10 rival or Ultegra and it seems to be a great bike....Is there really any reason for me to go to carbon...frame at all ...the weight difference isn't that much and probably wouldn't make a difference for the guy like me using it for exercise and nice 25-50 mile rides on the weekend....