Thanks Phil, Colleen, Arthur, Gaby, Suvi and Russ!
Yes, these are very nice birds, and tough to find.
Colleen - you're probably pretty unlikely to see them in your area, which is in their winter range. There is a very small area of the country where they are found year-round (the 'wet side' of the mountains from very northern California up into BC and a bit of eastern WA, southern British Columbia and Alberta. They are forest birds, so in the wine country where you are, you would most likely have to be in a wooded area, or near one, to see them - although of course in migration like any species they can be found in some odd places with luck. Their summer range extends all the way up into Alaska.
Some of the birds are migratory, obviously, but in areas like our state where they are resident year-round, there are some that don't really migrate per se, but rather move down in elevation in the winter to milder conditions, then 'migrate' upslope again in the spring to their higher elevation breeding areas.
If you are lucky enough to see one, especially a male, it will be a thrill.
Interestingly, I got a good photo of one that visited our little recirculating stream in the yard a couple years ago, and submitted the image to Cornell's Lab of Ornithology since I participate in some of their survey programs. They went crazy over the photo since they don't get the birds back in New York, and it is on their website and has been used in at least one of their brochures as well.
Thanks again, everyone!