I am also in the market for a new tri bike. Unfortunately, my budget is shot and I will not be buying one for a while. What I have learned is that for all around bang for your buck, most people recommend Cervelo. The P2C is a good place to start. I don't know much about Kestrals, but the QR Lucero gets a very good review but at a much higher cost.

The new WSD Trek Equinox also gets a good review and it's cheap, but it only comes with Shimano 105, even the rear derailler.

Kuota Kalibur also got rave reviews, again, big price tag.

Hope that helps.