I got the 2" kit from 4wd.com, they are reasonable and good to work with. I would do this rather than add a leaf, then you have new springs that should be good for a long time. Mine was for a wrangler.
My catalogs don't show any Cherokee stuff, but search the web, there are some kits out there. 4wd Hardware offers a 3" kit, Tuff Country a 3.5", Old Man Emu a 2.5".... those are reputable names. $500-$700 and you have confidence in your suspension pieces for 10 or 15 years.