I just bounced this off of Dave Irons and Shawneen Finnegan, two top notch birders who live in Oregon who live with Orange-crowneds throughout the year. (Well, not literally.) David's reply was a simple "absolutely an Orange-crowned." I'd be glad to send it out to a few other folks especially if there are specific questions.
I think Orange-crowneds are an under appreciated bird in the U.S. because they're not as snazzy as the other species. They have several races ranging from dull as all get-out to a bright greenish with a bluish gray head to bright greenish yellow all over. The Channel Islands race has a really pointed and curved bill, reminding me of some of the Hawaiian endemics. And once you get into fall plumages, it seems that every gap in between gets filled. They also have a greater ability to overwinter than most other warbler species. They really are cool little birds.