Type of terrain... rocks, rock crawling, mud, sand, hills... etc.
For 33's there are many ways to achieve this.
You can go w/ following examples:
2"BB (Budget Boost) / 1" BL (Body Lift) / 1" MML (Motor Mount Lift)
2" Lift kit from OME w/ BL & MML
3" Econoy Lift kit from Tera Flex or Full Traction
3" Lift Kit w/ control arms, Teraflex, Rubicon Express, Full Traction
4" Lift kit "as stated"
Your best bet would be to look thru the "LIFT REVIEW" sticky at the top and get an idea of the different lifts people have used and the comments about them as well.