englemann spruce is also popular here in the NW with lots of info available. It is one of michael hagedorn's favorite subjects. You also didn't mention the alpine firs, more thought of in terms of landscaping but they make wonderful bonsai. Red cedar and yellow are quite difficult to collect
an abundance of information on. Interesting that the east coast is all over white cedar. Ryan Neil has just started workshops at his dojo for firs, which may be worth your while to sign up for. I have a semi-cascade douglas fir that I've worked on for the past two years since collection. I don't see many of them, but have found mine easy to work with. Hemlock, has been more of a disappointment in my experience, just deciding in days that it goes from looking hale and hearty to it's death bed. Atleast most of the others tip you off they're unhappy so you can make some adjustments. While I appreciate both native and japanese trees for use as bonsai, I find myself drifting toward more of a focus on native trees.
Hope there's something in the ramble, you can use