Just my $.02 but I personally live in the Oregon (Bend) area and have grown up here and all my rental investments, etc. are out of state. I find that i'm getting much better cap rates elsewhere. Oregon has a low pop. density and I find that in the market conditions (currently as of 1/12/16) , that good rental areas or higher density areas with good renter pools are overpriced and offer low cap rates. The areas that have attractive pricing end up being places like Pendleton, Hermiston or Madras, etc. and have IMO a poor renter pool / pop. base.
I personally house hacked a 4-plex myself when starting out, but I bought for $192k in 2012 ... theres no way I could do it right now. Having said that, i'm sure there are many who are craftier than I at acquiring good deals.
Although I will acknowledge that if your starting out it is much scarier (and impossible to 'house-hack') when working out of town. I would suggest that if you want to pick PDX to be your market that you operate in, then take a close look at what REI strategy lends itself to that market and pursue the path of least resistance, rather than trying to force your strategy on a given market (not saying thats what your doing). I spent a few months scouring the I-5 Corridor looking for buy-n-hold rental income props and couldn't find anything to get excited about, but now we are closing on 16 units out of state and will have a 14%-18% cash on cash return / cap rate given 75% or better occupancy. The numbers are there, but definitely require a little more initial startup efforts if going out of state.
Just food for thought. But I will say, if you can come up with something profitable in the valley area now, then it will likely pay big dividends later (or built in equity) that I wont get in my out of state portfolio.