Roseburg is Oregon's turkey capital. Colville is Washington's turkey capital.
I've never hunted Dufur area for turkey but, there should be some over that way.
You are going to find out in scouting that having permission on good land is the biggest part of the game. If the land you already have has turkey I'd definitely go with that for your first season. If nothing else, you might end up with a good dove hunting area for the fall, before duck opens.