Tony:
Don't have much to add - my FFR isn't registered yet. My preliminary research shows (sorry, no links, so this should only be considered "rumor") that the VIN inspection requirement has been dropped as being too expensive for not enough benefit.
Oh, and I made the same move myself a few years back. Moved from Hyde Park to within the Seattle city limits. Let me know if you have any questions, etc.
--Joe
Update - These seem to indicate the VIN inspection is still required:
http://apps.leg.wa.gov/RCW/default.aspx?cite=46.12.440
http://apps.leg.wa.gov/RCW/default.aspx?cite=46.16.680