I've wanted to put up a fence (and gate) for quite a while, but I've been put-off by the "pick two" aspect of building a "100 year fence".
Last night I stumbled on this video: https://www.youtube.com/watch?v=yE-t86b07yM
The posts are oiled cast concrete. One change I'll make is using fiberglass rebar instead of metal.
This satisfies "good" and "cheap", but it will take quite some time to cast the near 200 posts I need. I'll have to make a half dozen forms if I want to to be done within the year.