2008 Cervelo Soloist Team Ultegra
While the Soloist Team has the technical features, the ride quality and the pedigree to be a very expensive "super frame", it is in fact the least expensive way to ride the exact same frame the top pros ride.
And if that isn't reason enough, it also morphs into a part-time TT/Tri bike for those who desire so, simply by using the Cervélo aero seatpost with flippable head.