My 2009 CAAD9 6 came with Tiagra, and shifted as well as the 6600 Ultegra I replaced it with. Had I not gotten an excellent deal on the Ultegra (used, from a riding buddy), I'd still be on the Tiagra. And good quality nine speed stuff (chains, cassettes, etc.) is half the price of equivalent ten speed stuff. If I could find the frame I want, I'd transfer the ten speed drivetrain to the new frame and put the Tiagra back on the CAAD9, and be happy riding either.