Where is the best Japanese garden is the United States?

The very best exclusively Japanese Garden I've seen was when I was a child and visited San Francisco. http://www.sfpt.org/jtg_tours.html





On the other hand, the best overall garden that I've seen was not in the United States... but close:


http://www.butchartgardens.com/

Where is the best Japanese garden is the United States?
I remember the Brooklyn Botanical Garden having a great one, but that was years ago, and maybe it was temporary.