Ryno:
There is nothing to say that you cant put clip-ons on an OCR, hell theres a recent discussion about putting clipons on a mountain bike. However, that said, since aloys was originally asking about road bikes that would be "good" choices for road bikes, the OCR (and its specialized cousin) would not be good choices for the reasons stated above.
The OCR line of bikes has a more relaxed riding position. Due to its longer head tube and the stems that are typically shipped with the bike, the rider tends to ride in a more upright position. It would be difficult to ride in a low aero position with the longer headtube because you wouldnt be able to get the front end low enough without resorting to a negative rise stem or something like a look ergostem. This can have an effect on handling and stability not to mention comfort.
Theres nothing to say that you cant do it, Try it and find out if you like it...
As an aside:
Tom D. has written on this topic here:
http://www.xtri.com/article.asp?id=126