If you're looking to rent the property out, you might look in College towns. Portland, Eugene, Corvallis, Forest Grove... etc. If you're looking for resale value, look at cities that are up and coming. New subdivisions with signs of growth in the future or a current low value. Although, prices are very low given this current market situation, there are many cities that are priced even lower due to other reasons (one being lack of job opportunity) like Central Oregon: Bend, Sisters, Redmond...etc.
If you check the "stats & trends" portion of this website, you may find what style and location best fits what you are looking for. While searching for the best location and style, you may want to shop around and find the best real estate professional to help you in your home investment as well.
I hope I helped, and goodluck! :)