depends on what you plan on doing w/ the Jeep.
you can take the 3'' BL off and run the stock body mounts w/ 31 inch tires.
If you want to goto 33's then most suggest something like a 2'' Suspension lift (budget boost or new coils) and a 1-1.25'' Body lift.
small body lifts aren't bad (they allow many other parts to be installed like armor). anything 2" and over is considered bad juju.
Going bigger than what I suggested above usually requires other parts (control arms, SYE, etc)