Hi there and a pending welcome to the Bay Area! It depends what you are looking for. Kids here are really advanced and there�s tremendous pressure to achieve young in schools. I would recommend living wisdom school in Palo Alto. They do differentiate and as long as your son isn�t performing 4+ years or so ahead- they will bump him up for math and possibly writing a year or two.
Additionally if you have time take a look at http://www.twicegifted.org it is a science lab org that also gives other classes geared for gifted kids and 2e. They currently operate on homeschool hours but are expanding. Sign up for the email- there�s a lot of resources there on the site about doctors neuropsychs etc.
Good luck!
