I have a Klein Q Carbon Team. I paid about 1800.00 for it 2 years ago and that was a deal, it retailed about 2300.00. I adore this bike. It has a Carbon fork and seatstay. It rides beautifully and has great pep going up hills.
It's rides much better than a all aluminion bike, it's not stiff.
All Carbon Bikes have come down in price since then it would be great if you can test them both. That's truly the best way to decide what you want.

Good Luck and have fun shopping!!
Kim