The Synapse bikes are nice. The Sport 5 has all 105 which is a upgrade from the Tiagra. The Trek 2.1 is also a nice bike, but with all of them similar in price and components, I would ride them all and see which one feel the best for your body size. In any event, wheels will need to be addressed at 260. I really like the Synapse 5 though. I almost bought the Synapse versus the CAAD9.
Have you checked to see if they had any 07 closeouts? Might be able to get more bike for less bucks.
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Brian | 2023 Trek Domane SLR 7 AXS | 2023 Trek CheckPoint SL 7 AXS | 2016 Trek Emonda ALR | 2022 Trek FX Sport 5
you should learn to embrace change, and mock it's failings every step of the way.