One more vote for RE.
Remember though that lifting is only part of the plan for running 33" tires if you plan on wheeling the truck. You'll want to look into upgrading the gearing in the axles, replacing the rear axle if you've got the Dana 35, upgrading the U-joints/shafts in the front axle (late model XJ/TJ shafts will go right in and have the bigger U-joints), and lockers, lockers, lockers. :D