I'm not a C'dale owner, but came across a great fitting helmet at the LBS while shopping for a new Specialized Propero II or Prevail. Obviously helmets are a personal fit thing and should never be purchased based just on price. But if this fits your head then here's a deal: Cannondale Teramo Helmet and take 20% off with either code halloween20 or save20.

The lid fits my noggin perfectly and the helmet weighs less than the great Specialized S Works helmet costing, well, that's over $200. The Teramo has garnered lots of great feedback based on quality and price. I posted this thread after buying one for about $87 delivered. Free returns, too. And the "Cannondale" stickers are easily removed.