You will get a lot of ideas on this but save your money for some quality and do it once and be very happy.
OME or BDS
RC is cheap but not worth it ask me how I know.
There are a lot of ways to do this get a kit or just piece one together buy the springs and shocks separately. New hardware is a must.
X2 ^ Heli_m1, I'm in the same boat as you. I want to put between 2.5" and 3.5" of lift on mine as well. I've been doing research for months (seems like years), and I've come to the conclusion that I'm going to save until spring and go with something quality. Probably OME 2.5" with 2" shakles for a total of 3.5" of lift.
What are your plans for the jeep? Is it a daily driver/weekend warrior or just a toy?
A lot of guys end up doing a 4 inch lift and then adding a 1" body lift and 1"shackles. The nice thing about this set up is you can do it in stages, in any order. I did 1"shackles, 1" Body lift and 1" motor mount lift for less than 300 bucks. I also trimmed my fenders and moved my flares up 1" for free.lol $100-$150 an inch is pretty cheap clearance..
As far as springs and stuff go, Like was said earlier, save your dollars and do it right all at once. I would really advise SYE/CV with your lift too. Transfer case drops defeat some of the lift and every inch counts there with break over.
Ebay is a very dangerous place for a jeeper's bank account. Go check it out...