You haven't said how you're going to use it? That'll make all the difference for advise/best rig for you're situation.
I bought a 94 F350 dump last year with the 460/auto to move a bankful of material to build a garage. Got my money's worth out of it, and sold it, and also learned a bit about dumps. It had an electric dump, which would ~just~ dump a FULL load of gravel or heavy clay/dirt....but would absolutely knock the (brand new) battery down to dead. I would fill it up to the point of bottoming shocks over small bumps. And climbing hills with a load was a challenge. You won't be able to take a full load and tow any kind of load at the same time.
Bottom line for me, if you want to move a decent amount of material, go diesel and at least a f550 sized vehicle with a 9-10 ft bed. The 1 tons are just too limited, in my opinion, unless you have unlimited time to make numerous trips.
I will get another one in the future, and would look for a 550 with 10' bed, and 4wd. If I didn't need the 4wd I would seriously consider the advice of others and look at a ford/international 5 ton, keep it under 26K so no CDL needed, and they are much heavier duty and can take much more payload.
Good luck!