Thanks, Edwin! My 2 kids are now at San Jose Highly Gifted Magnet, a public elementary 25 minutes away. We can't afford Mirman but can't imagine a better fit than we've found at San Jose, academically and socially. I updated the Wikipedia page on Highly Gifted Magnets so there are links to all 5 HG public school options in the Los Angeles area.

http://en.wikipedia.org/wiki/Highly_Gifted_Magnet