Thing is, say a guy did flop the straight. You still have really good equity vs him, and I wouldn't ever feel bad if someone reraised, and you stacked off. You are roughly 33% to hit your FH on the river, so if you are getting the right odds, chase away my friend. Don't be afraid to bet your sets on the flop if theres 3 to a straight/flush. Get those bets in while you are ahead/marginally behind.