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Grew up on Rainier, but it's getting a lot more expensive as the bots discover there's stuff east of Renton.
I say it's all the same. Find a feature you like (water, hill, cedars) and get something within walking distance.
Or better, just walk the property you're looking at. Write a full plan outlining what "off grid" will mean to you, and pick the spot that ticks the most boxes.