As far as running gear and keeping the axles centered under the jeep, a three inch lift will be fairly complete, and place no real stress on your driveline. I have a tf coil lift with spares, so 2.5 plus .75 for about 3.25 inches of lift. It rides really well.
The real money comes from having to regear. I did run my 3.8 l jku Sahara for a while with the 35's, but quickly decided to regear to 5.13's in the tune of $1600,!
You can fit 33's with no lift, but they look better with a 2 inch budget boost, or even a one inch body lift. And you will be borderline with needing gears. A rubi will not need gears with 33's, as it has 4.11 from the factory(2007 to 2011).