I've never heard of problems with the Talon seatpost, though a lot of carbon bikes with carbon posts tend to have that problem now a days.
Honestly, they are quite different fitting bikes, I couldn't fit the Kestrel(it's geometetry is much more slack and upright), with my current position, the Blue I could probably get close, but the Jamis would probably fit. I tend to say fit above all else.
In the last year and a half I have actually converted back to riding quite steep.
How did you come up with these bikes as your choices if I may ask?