Hey Gordo - Another question you might want to think about is which species of bird you want to go after. Here is a link to a harvest report by county
http://www.geocities.com/wanwtf/harvest.htm
and here is a distribution map (it is a flash map)
http://www.geocities.com/wanwtf/distribution.htm
There are birds all over the place. Stevens is definately the biggest, Lincoln, Klickitat, and Ferry counties are also good hunting.