I waited until I had a full 20% to get in the market, turns out I should have bought earlier because the 20% isn't going to help me now anyway given the all-cash offers out there. From what I have heard, a lot of this is due to foreign capital looking for a value store. But I also think this will just continue and get worse, as people in the Bay area look at the quality of life in Portland, compare housing prices, and conclude (rightly IMO) that the move is a no-brainer.
There's some good deals out there still but yeah.. in the same boat as you. I'm working on compiling historical pricing on a neighborhood basis so I can focus my attention on areas that haven't been seeing 10%+/yr gains. West Hills, for instance, homes have been appreciating only about 3%/yr. Of course those were way out of my budget to begin with...