i use different springs than you are planning on, and my body lift is a quarter inch smaller than you have, so i only have a 1/4" more lift than you are planning on (+ 3/4" spacers in front, just to level it out a little) and i am happy with the way my 33's fit. i am not sure how much backspacing the ravine's have (it is around 6" or so) but i use spidertrax spacers and they fit fine.
'06 6cyl 6spd X - 2.5" Rough Country Progressive Springs, Rough Country Performance 2.2 Shocks and Steering Stabilizer, 1" PA BL, 1" JKS MML, 33x12.50 TrXus M/T's w/ Spidertrax 1.25" Spacers on 15x8 Ravines
JEEP is spelled wrong.. It should be spelled J-U-N-K