First of all welcome to the forum!!
As far as your hunt is going, if people are going to be like that and tell you things then take your money elsewhere and let them sit on it. Who cares...
There are way to many jeeps out there for people to be like that. As far as taking it to a mechanic... If its clean and appears to be taken care of and its not lifted and all that its probably okay to forego the mechanic check out. Major things you need to watch out for are rust. You want to check the frame pretty good and any rust thats there, just make sure its surface rust. Push on it a little but dont run your finger through it.
I dont think your being to picky but you have to know that these old wranglers are pretty rock solid. You really have to abuse them and never change to oil for them to have major issues. Most stuff is relatively simple to fix and not to expensive. Just be patient and keep looking. Good luck