I would not race on conti 4000s, I would train on them though. When I raced on clinchers I used the Michelin Pro2s and I really liked them.
If you don't mind spending a few more dollars I would look at the Vittoria open tubulars.

So if you are looking for a tire to train and race on- look at the 4000s because they hold up through a lot. If you are just looking for a race tire I would look for something lighter, in the area of the Michelin Pros or an open tubular.