Hi and Welcome!
Just wanted to pipe in to say that the advice that you will hear from everyone around you may not apply to your child. You know this, and getting used to the idea is just one of the things you'll start to grow into.
While the argument is often made that boys do better as the oldest rather than the youngest, this is not always true. Obviously, his academic abilities would place him with older academic peers. Honestly, people you know may not really be able to fathom just how far ahead your DS is in this regard. But, what a lot of people, including many educators, focus on is not academics (which you would think school would be primarily about) but more social things. So, consider: your child's physical stature compared to his age peers vs. academic peers, his social maturity, whether he has good enough and fast enough handwriting to keep up with assignments, who his playmates tend to be (older kids? kids his own age?), whether he will likely want to play sports (older is usually better for the serious athlete), whether he has older siblings, etc. IME, the best way for you to compare the different classrooms and peer groups into which you're considering placing your child is for you to go and observe some different classrooms while the kids are working and playing there.
When you removed your DS from the trasitional K program, were the reasons academic or social or both? That might be a huge clue as to where he would belong. Sticking him in K next year would just place him back with the same kids. I can't imagine that would be appropriate.
Do you have any IQ or achievement testing?
BTW: My DS skipped K and is further accelerated in math and still people think we redshirted him!
