Here's an easy way out...
Get a SkyJacker full length AAL from a supplier (the skyjackers will take a while to break in and can be a little stiff). Go to a junkyard for mid-90's ZJ 5.9 front coils and isolators. New U-bolts will be necessary for the rear and cheap spring clamps are recommended if they don't come with the AAL.
SkyJacker FL AAL + mid 90's ZJ 5.9 coils + front isolators = 2.6"F/2.8"R lift (you'll need to get longer shocks before you wheel it).
You'll get this stuff for about $130. You can probably find some decent used 3" lift shocks for $100 if you look around hard enough. If you do, you'll be ready to go for less than $250 (but don't count on lots of flex). This is what I did to mine, and I like it. Handles fantastic on the street, and enablles me to run washboard dirt roads out in the deserts at slightly higher speeds, relatively comfortably (I'm runnin' 235's on stock rims).