I just bought an 82 300TDT with 245k, and a rebuilt tranny (less than 20k), and all new front end. It has no body damage and no significant rust, thought the paint is tired and oxidized. It has the third-row seat, and every stock feature works except for the power antenna. The interior is good, but not mint, a well kept 250k.
Sounds pretty similar to what you are looking at.
I paid 2400$ for mine, and felt like I was getting a very good deal. I was shopping for cars in the 2000$ to 3500$ range. Hope this helps! Good luck finding a good wagon. They are a little on the rare side, but are great cars, I love mine.
Peace,
sam