if your trck is 4x4 and you have 3.73 gears in it now i whould say yes it is a fair deal, i've heard out west the ford 8.8 is starting to go for $600-800.
i paid $250 for a 2001 in hawaii and it had no brake pads
i did this swap on my tj it was only cheaper cause i didnt have to swap gears.
now weldin spring pads for leaf springs is of course going to be less work as the tj has coils, control arm brackets, and the purchase of that kit was $400
i think M.O.R.E offroad has a kit for the 8.8 in to the xj
good luck i realy liked the out come of my ford 8.8