Socialization, socialization, socialization. Your child needs to learn how to interact with others his age or he will be an outsider. Let him go to kindergarten and let him be for this year.You may want to consider a private school, or even religious based one. However, we really haven't been in school long enough to make any sort of judgement, either. Kindergarten, when the kids are actually there for more than 2 days, moves fast enough to keep his attention. You can do things for him after school, but even then I would highly recommend some sort of sports so that he gets physical coordination. I would be more concerned about his well-roundedness at this age. Pay attention to his whole being. I knew a girl who moved up a grade because she was so bright, became a teenager and wanted to fit in because she didn't, so started sleeping around at 14,and partied every time she could get away from her parents. She didn't want to be different anymore. It seems so far away now because they are so little , but wanted to be accepted is right around the corner.
I know Seminole County has a gifted program; I am assuming Orange does as well. GIve it a year and work with him at home. Then see where you stand.
PS I just read what some of the other moms' said and i really agree with getting your teacher to work with you. The education system is there to help us; we should use it better.