I would go with a lift that is advertised as a 2.5" lift, which in reality will net you about 3" of real lift. That, I think is the sweet spot with 33's on a JK. Teraflex, Rock Krawler, and Old Man Emu all have 2.5" lifts. And Im sure there is quite a few others as well.
Whatever the manufacturer's are advertising the lifts as...add .50"-.75" of lift. That is what you will get in reality unless you already have heavy aftermarket bumpers and a winch.