I would say a good starting place for a rig would be around $8k-$9k.
Add: (I've factored in an extra 15% on top of the listed price, you need to add shipping charges)
A/C: $1,400 (BC Broncos)
Front Disc Conversion: $900 (Wild Horses 4x4)
Power Brakes: $500 (Wild Horses 4x4)
Bearings, seals, etc.: $500
Total: $11,300-$12,300
You might as well round that up some for other parts that you might of forgot to add, or that you run into needing replacement.
You can definitely get into a Bronco cheaper than a new truck. You'll have some class too
but you just need to sit down and decide what it's purpose will be. What I listed was an exceptional DD/road queen. If you wanted to do more off-roading, factor in a lower gearset, possibly a different transmission, bigger meats (tires) and a lift kit/flares. (Depending on tire size.)