These bikes today...
It's worth noting that both the 105 and the new Ultegra Nashbar carbon bikes use some downgraded components.
For the 105 there is an alloy steerer on the fork on new models, which is a downgrade from previous models' full carbon forks. Otherwise the Nashbar is an unbranded Fuji Altamira frameset.
They really cheaped out on the new Ultegra bike it seems. Last year's CR5 which was listed at the same price, had the Ultegra crankset (vs. FSA), Shimano RS11 wheels (vs Vuelta), Ultegra Cassette (vs 105), and also had FSA finishing kit vs. no name, and internal cable routing (up to you if it's better or not)
Not saying that either bike is garbage, but the new Nashbar carbon bike supplier put on different components than the now out-of-business previous supplier
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Never give a gun to ducks No bike does everything perfectly. In fact, no bike does anything until someone gets on it to ride.