Carbon fiber can be great for specific uses, but a nice set of wheels on a mediocre frame can really give your older rides a jolt in the arm for not nearly as much money.
That said, I am the proud owner of an Orbea Ordu.
This was a "congrats on the new job" gift to myself. I have two other bikes which are both aluminum, and have noted that: (1) the bike is amazingly fast on flats and downhill, (2) i can feel the frame flexing if I get going really fast downhill, and (3) my body doesn't feel the abuse after a long ride like it does on the aluminum frames. Vespa is right about the wheel sets, my normal riding set is lower range set of Mavics which I don't have to worry about evaporating under me on the Wisconsnin road ways.
Most of the high end bikes can be great, and you just have to get the one that speaks to you during your test ride. I highly recommend a professional fitting too, it can turn your fancy new bike into your favorite ride!