I thought a little while about my experiences before responding to this thread again as it seemed to become a bit of a blood sport for a while -- but I would simply put it this way....
I read a lot before I bought an older tractor on forums like this and other places and I talked to a number of people with experience far greater than mine when it came to tractors and their use ....
I observed that many of my neighbours still had older tractors which they put to occasional or even everday use and that the prices of many of these tractors were within my envisioned price range....
Then with the encouragement of a few and a sense of confidence from the above activities I peed on the fence and bought an older tractor,,,,, I can laugh about it now after several years!!!
Then, since the definition of insanity is doing the same thing over and over and expecting a different outcome,
I read a bunch more about newer tractors on this and other forums (in between buying and reading repair manuals)
I observed and talked to my neighbours about their newer tractors that they used to conduct their business everyday,,,,
Then I made friends with a fence tester!!!!
And I went and bought a new (albeit cheap!)tractor with him -- so far with excellent results.
So Mattman I would simply say what I have said previously here -- find someone with experience (and not the person selling something) to help you (the fence tester) -- and remember that people who tell you that in their vast experience the best way to test a fence is to pee on it (because they don't believe in those newfangled fence testers) are always right on a dark night when the fence is solar powered and has no battery

-- not sure I like the odds.
Merry Christmas Everyone
Regards
Steve