I just bought a marginal 1990 with 200,000 miles for $1700; it apparently has many more problems than yours:

1. It will need a timing belt soon
2. Needs new front oil seal
3. Needs new valve cover gaskets
4. Might need new head gaskets
5. Idles very high
6. Just installed new alternator/battery
7. Overall, very little rust (some on the bottom behind the rear wheels).

If the truck is running nice and smooth and is $1800; go for it!

You will probably do much better than I did if you purchase it; however, there are not many to be found in my area, so it's a little bit more of a seller's market.

This may sound cheesy, but every old truck needs a caring owner - the one who will bring it back to life. Either that, or it dies in the junkyard. I will resurrect my Montero; it will be the Phoenix rising from the ashes...I hope.