I friend of mine has a 2003 F-250 with the 7.3L Diesel for sale that I am going to look at tomorrow. It has 75,000 miles on it, and I know it has had meticulous care (he is a retired heavy diesel mech...
Friend of mine has a 2002 F250 with the 7.3L he loves it. Hasn't had any major issues, about the same mileage as the one your looking at. Gets pretty good MPG with his stick, better then my 2005 Auto did. If I found a good, reliable and well maintained one I'd be all over it. Few & far between it seems though.