Agreed with the above. I don't think that any of those are that different from what you have. Either save some money and then sell your Fuji and go for low-end carbon, save some more and get a nicer carbon bike, or you could do as Emily suggested and go for carbon frame and upgrade once parts wear out. However, I'd be more inclined to go for a complete bike, because you can't get nearly as good a deal on components as the manufacturer can.

It is true that the current iteration of Shimano Tiagra is surprisingly nice, though. But my guess is that most of those bike are Tiagra rear derailleur and maybe shifters and Sora everything else.