I think the best advice I could give people in Portland is that "Oregon is more than Portland". Property prices are 2-4x the prices for the rest of the state & the rents are pretty close to the same. Depending on what your are looking for there are several more rural areas around Portland that people commute into Portland from that would cash flow. If you want to move even farther out, look for towns that have good rent-purchase price, but still show some growth in the market. Once you have targeted the areas that you would like to invest in, start looking for the worse houses in the best neighbor hoods. Those are the gold mines.
I personally invest in Salem. I have purchased in order, 1 MLS, 1 Auction, 2 Shortsale, 1 MLS & 1 Auction. So its important, if your are not going to direct market, to keep your eyes open for great deals and snap them up. Another piece of advice I can offer is to do more than put lipstick on a pig. If you can learn to find the hidden potential in a property you are more likely to be successful & find deals others haven't.