A lot of info missing. Mainly mileage and condition. Those are the huge ones. Pictures would help. Also, you did not mention lift, tire size etc. But as has been said, take a value for a stock one, then 1/2 of the material cost of upgrades.
I will say that in the past 5 years, the view of how a lifted rig is values has changed. More to the stock value + 1/2 cost of materials. In the past some lifted rigs sold for about $5,500. The value of pristine XJs has gone up. Say $8,500 and up. There was someone on another site, with a 3 inch lifted XJ at 50K and sold it for $13,500 or so.