Anyone an avid cross racer? I'm building up a carbon Scott frame/fork to race this year and I have the wheels, and should have the frame/fork later summer. I've attached a screen shot of how I'm thinking about building it. One of the top local pros runs 105 components and claim they hold up better than Ultegra or DA because they have bushing in the pulleys, etc instead of sealed bearings.....can anyone validate this? I have 105 on my road bike, so I was thinking about putting DA on it and swapping the 105 to the new cross bike.