If it were me (and I say that because I've followed a similar path as you), I would spend less on the frame and more on the wheelset. In my case, I bought a $1000 Motobecane Nemesis and a used pair of Zipp 404s with a PT.
I don't think frame aerodynamics make very much difference compared to your body and the wheels and I can always upgrade the frameset later and I have a nice set of wheels I can transfer to the new bike if I ever feel the need to spend more on a TT bike. I also don't think you really _need_ anything higher than Ultegra for a TT bike (but I certainly don't hold it against folks who have full carbon, full DA TT bikes--I lust after their bikes but hold no grudge).
--Steve