I am waiting for PP to chime in on your little make offer crap. I would give you no more then $1500 personally.
Might want to include interior pics and maybe how many miles are on the XJ. Is this a 8" long arm set up or adjustable control arms? At 8", you must have some hardcore angles going on. What have you done to the steering to correspond to the amount of lift you have? Also, you say the tires are like new...then they must not come with much tread on them brand new...