Perhaps a little more information would be helpful. Are you riding english or western? What exactly do you mean by "crazy"? In what ways is he acting up? Snaffles are your regular basic bit that work for many people, including myself. I wouldn't be in a hurry to change bits simply because he is acting up. His behaviour could stem from many reasons. Perhaps the bit is too tight or too loose. How old is your horse?
More info would really help me answer the question.