Why does everyone c/r the turn? I would call the turn bet and then fire on the river.
-When he bets the turn, there will be enough in the pot (1,000 chips+) that you will be happy to take it down.
-Calling two decent sized bets on a drawless board arouses suspicion, he's unlikely to call a river bet if he wouldnt call the turn raise. (unless he hit two pair on 5th street

)
-It can sometimes be easier to get chips in on the turn (when your opponent can still hit his miracle) than on the river (when he knows he's missed completely)