I would NOT get him declawed. It would have been much better if he was neutered at 4 months old and declawed at the same time. Unneutered male cats/dogs are ANNOYING to say the least. He may get slightly better as the hormone levels drop, but he probably won't ever be the kind of cat he would have been if he had gotten neutered when he was supposed to.

Also, declawed cats know that they don't have claws and will instead start using their teeth. Not a good idea if you like your fingers.