OP
Yeah, I get what you're saying. Again, I think it depends on personal preference.
My TJ has 156k on it, but I've done all the work getting it mechanically sound. As such, I will hop in it and drive it anywhere within a 500 miles without hesitation (longer than that is more a question of what my back can take, not the confidence i have in my rig).The 4.0 is known to go up to 300k miles without major problems. I kinda feel like mine is just getting broken in.
I wouldn't hesitate to buy and build a TJ or an XJ with the 4.0 if it had less than 200k on it (with the caveat that it was not beat on a bunch and didn't have a ton of obvious problems).
Mine's got some mileage on it but runs great. And I mean I could buy one with 80k miles on it that has problems, right? Makes more sense I think just to enjoy what I already have and fix or upgrade things when it makes sense financially.
Who knows, 10 years from now I might have 44's with selectable lockers, 5.13 gears, 35" in tires, and a stroker, or could still be rocking 235/75r15's with 3.07 open diffs and way too much lift ... probably going to have the same amount of fun either way ...