I live in Seattle area, and from what I see, I am also strongly bullish in the Seattle market. Per anecdotes I keep hearing, there are still 15 offers per houses for every somewhat good house. typical 4 bed/3bath new constructions in areas like Bothell and Shoreline are going for ~$1M. Condos in South Lake union are just shy of a million. I dont think this is a bubble. Seattle is becoming the hub of so many areas of Technology - Machine Learning, Cloud Computing, Drones to name a few. On top of that, with water and mountain on two sides, there are so much land to build.
On another note, a chunk of bigger pocket investors tend to believe the you should invest for cashflow, not appreciation. That is, frankly foolish. You can always predict long term appreciation. A vibrant city like Seattle, Boulder, or even NY will always beat out a dying mid west city in terms of long term appreciation, liquidity in case you need to sell, and rent increase. A good investment is always a balance between appreciation and cash flow.