Im with the guys that are saying $4500, maaayyybe $5000, but the good, clean trucks are getting pretty tough to find. Air bags arent cheap for sure. But im getting a 92 that i will bet the title that mine is cleaner and in better shape. It also has a FULL engine rebuild 40k ago (pistons, valves, balance, headwork, SMF) and a turbo (i see yours is also turbo'd) to add to the list of goodies, new tires( less than ,5k on them, Firestones) brakes (calipers and MC included), vaccuum pump, 3G, return lines and o-rings (also 0-rings in the fuel lines) last but not least a new lift pump as well.
All that for $4,000 which id say its well worth it, even though it only bluebooks at $2900

Not trying to make you feel bad, just saying maybe you shouldve shopped around a little more is all. I second what the other guy said about being careful buying from mechanics.