I run Rocky Road Outfitters Drop Brackets. They have a better bracket support system than the other 2 companies suggested. A bit more expensive, but worth it if you are not going with Long arms.
Also please consider the options available for shackle relocation brackets for the rear. As suggested, your ride and certainly your flex will be like poo if you do not. NO shock can fix that issue.
If you have not been drenching ALL fasteners with PB blaster type juice - shocks (expect to snap off the upper rear shock bolts and work that issue) upper shackle bolts, front leaf spring bolts, control arm fasteners, hitch (if equipped) hardware etc. you will have a great deal of effort ahead of you considering the 13 years of winter your XJ has seen. Have extra fasteners, torches, breaker bars, angle grinders, sawall etc. ready to go.
You do not need a bigger sway bar, you need longer swaybar end links.
IRO sells a very good adjustable double shear trackbar set up and a tough tie rod replacement as well.