I would give him some time , maybe take him to obediance school if you can. It depends on the dog but sometimes it can take the 2 years or longer to grow out of their puppy stage. My heeler (i knew these dogs could be destructive when we got him, but he has turned out to be the best dog i have ever owned) is just about to turn two and he just got out of his "destroy the house mode" a few months ago, he used to dig the satellite cables out of the ground, chew up clothes, one time he was outside and tried to chew himself into the house by ripping the siding off of the house by the back door, and to this day i cant leave him alone in the house. This is not a reason to put a dog down though, dogs should only be put down when they are aggressive or have bitten someone. As for the hyperness, my sister had a staffie and he turned out to be the best dog she ever owned, he was hyper and destructive at first but he grew out of it. Good luck with your dog, hope everything works out.
One other thing, Staffies are a type of pit bull (some people say that they arent, I have heard many arguments about this), and all pit bulls tend to be bullheaded, so make sure that you stay consistant when disciplining him. They need to know that you are the one in charge.