I'll echo the suggestion of a home-based setting. DS1 was in one from 5mos until a couple of months back. When he was deep into his hitting/biting phase, she'd let us know, but that was it. The preschool he's in now is doing pretty well for the most part - he came home with an abrasion on his back that was inflicted by one of the other kids, and they wrote it up and put it in his box so we'd know what happened. Of course, it sounds as if DS1 was being a thug, so I'm not too worried about the booboo.
On the other hand, the other night his dad asked if he needed a time-out, and he said, "No, I want to be a good boy!"
: ??? I told him that he's ALWAYS a good boy, but sometimes he forgets the proper way to behave. For some reason, that phrasing gave me the willies. Not trying to hijack the thread, but I need to have a chat with his teacher (who's an older lady) about that.