I've got a Madone 5.2 (the last USPS team bike) that I've ridden and loved for the past 4 years.

That being said, I test-rode a Jamis Xenith at our LBS a couple of weeks ago, and was really, really impressed by it. Very responsive in the corners, and accelerates well when you start stomping on the pedals... I wouldn't hesitate to pick one if I had to replace my faithful old Trek.

tom