Welcome to the forum!
I haven't kept up on prices of the trucks you're looking for. But I can tell you, as you've discovered, it will likely be very difficult to find an all original, nice condition truck that meets your criteria. Back in the 80's, that was one of the most popular truck to modify and go off-roading in. (read: thrash) I know because I had a couple friends that did just that, and they had 2 friends, and so on, and so on.

I guess my best advice would be to try and find one in the best condition you can, that hasn't been butchered into oblivion. (wiring is probably one of the biggies to look out for) No matter what you find, there's going to be something on it you'll want to change, to make it 'your' truck anyway, so don't get too hung up on being all stock or all original. Like I said, as long as it hasn't been hacked to death, little stuff is pretty easy to fix, even for a beginner.

Good luck.