Have you thought about possibly different areas of California like Sacramento?

Also, I think Washington state would be a good choice...I visited Seattle once and loved it! :)

I am not Caucasian and I don't really care about the ethnic population makeup of where I live, but I'll add that I live in Redmond, Washington and the population is very diverse. My neighborhood looks like the United Nations.

When people say the Eastside is not diverse, I wonder if they've been over here since 1985. :) For cities of their size, Bellevue, Kirkland, and Redmond are pretty colorful.

Vancouver, BC.

Redmond is almost 80% white, 1.5% black, 13% Asian, less than 6% Hispanic. That's not diverse at all.

Seattle is considerably more ethnically diverse than any of its eastern suburbs. The southern suburbs are more so, and are much more economically diverse as well. Seattle proper is 70% white, and there are very few places lower than that. Many of these white people in South King County are Hispanic, though. But Western Washington is one of the whitest areas of the country, exceeded only by Oregon in that regard.

You should be aware that Snoqualmie Ridge is an all-new development out in the middle of nowhere. If that's the kind of thing you want, it's pretty nice, at least compared with places like Marysville or Puyallup. You might look in Mill Creek, or elsewhere in NE King/SE Snohomish counties.

There are clusters of Asians (and other groups) all over the place, even in very white cities, of course. The Crossroads area of Bellevue, for instance.

Seattle house prices are through the roof as well. It's not as bad as the Bay Area, but there are no bargains to be had in the city limits unless you want to live in a condo. The deep suburbs still have some cheaper houses, but to my taste they're awful. You of course may differ.

Give Portland a look, too; it's kind of a smaller, less hectic (and less haughty) Seattle. They have a much more pleasant downtown, the world's greatest bookstore, and many affordable older neighborhoods.