I'm also in WA, and I'd be interested in the amazing private school that you found. I'm not happy with the one my child currently attends, and the other one doesn't look to be any better.
Bellevue does have a public, self-contained program for HG (99.7th percentile and above) kids. However, as far as I can tell, they only accept their own administration of the CogAT, with no appeals process involving private testing.
I am glad to live in a city with the UW, though, and we'll definitely be taking a close look at their early entrance program in a few years.
