I'm trying to determine the best teaching method in a preschool for my son.

I've looked a bit into the Reggio Emilia, Waldorf and Montessori methods, and am coming away confused as to what way would best compliment what my son already can do and will still be a challenge for him.

He turned three in February and is already reading level two books, and knows much of the academics that I understand is taught in Kindergarten and some of what is taught in first grade. I don't want his preschool experience to be one of learning the letter "A", etc. He's an outgoing child who needs to learn to sit still and pay attention; he's a chatter-box. His physical skills are slightly behind for typical.

Does anyone have advice about what I should look for in a school?