The one that fits best. Also go with a good LBS.
I was looking to stay around 2000 myself. One shop had Kuota and Felt. The other QR and Cervelo. The first shop was horrible compared to the other just with test rides. Immediately ruled that shop out. Spent a lot of time between the QR and Cervelo and ended up with the QR because it fit better.
Good luck in your search.