Thanks for your quick replies. Basically what I think I'm getting at are suggestion for carbon road bikes I could compete in cat 4 races with, but also with the ability of fit 700x28 tires. Also, a bike that can have a rack attached for a small pack, or something equivalent. Is it possible to put a rack on any bike? Even the ultra hardcore road bikes like the $9k Trek Madone?

I mentioned the Cervelo R3 because I think I read somewhere that it could even fit 700x32 tires and both bikes I mentioned, though carbon fiber, are sturdy enough to compete on the cobbles of the Paris-Roubaix race.