Figure on doing a complete cooling system overhaul (T'stat, t'stat housing, hoses, waterpump, belts and pulleys.) Transmission, unless recently changed would be something else to consider. Front end. Transfer case. Try a search on xoutpost for common failures there are a lot of items to consider. Some of those items would cost the best part of or more than the asking price so keep that in mind when you make an offer.
We have an '01 3.0L but it is still below 80K.