[bluefeet]

In our quest to win the monster pots, we often loose a substantial amount in the process. You don't have the nuts here, and there is no certainty CO will fire again on the river. By not raising the flop, you could basically give him two free cards in your attempt to win a big'ish pot. It's reasonable to expect him to have a piece of this broadway flop. I'd make it 150 to go here with the c-raise line. A t40 lead from the blinds might also set you up for a nice reraise situation, when an Ace tries to come over top your apparent FD.

Edit: The play from most is bad enough where you'll win much more playing fast, than you will slow.