Your best bet would be to trade it for something you can use, a vehicle of similar value.
Otherwise, I would think that a price of about $5-6k should be expected( I know you have more than that into it), unfortunately, even finished built rigs rarely bring more than $8-9k(even when they have $15-20k invested). You might be able to get more if you contact one of the local 4x4 shops in your area and explain your situation.
