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As the owner of a WRX, and early EA81 carby cars, I could say that you will not get 200000 miles out of a used Subaru engine.
Not many passenger car engine these days will do 200000 miles reliably.
A new 2.5 outback would be a lot better than previous models.
From what I have read to keep up with others technology, I would say Subaru is making their engines even better than previously.
They know of their headgasket design issues, and how many warranty claims were processed.
Your 2.5 being non-turbo, and servicing schedule adhered to, should be a reliable car.
You are welcome.
Happy New Year to you and your family.