What is making you want to build from scratch? I think you'll save yourself a great deal of headache and money by buying something already built. I just bought a Trek Madone (CF w/ Shimano 105 components) and have been having a blast with it. It's going to end up like a car where the sum of the parts ends up costing more than a fully built road ready bike sitting in a showroom.
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2014 CC R-Line DSG | 2010 S4 Sold | 2010 BMW 135i Retired | 2006 Lotus Exige Sold