i agree with Build your own; unless you're mechanically inclined (or at least have a bit of experience working with bicycles), a build isn't a good idea.
You might want to consider picking up a Kilo TT, then upgrading the bike one part at a time.
Once you've replaced things like bottom brackets, cranks, forks, etc., you'll have a better understanding of how everything works and can then probably buy a new frame.
as a bonus, you'll 1) already have bought most of the parts as upgrades, and 2) have a second bike you can throw fenders on and use to lock up or ride in crappy weather.