If you go spring-over, I'd suggest some YJ springs front and rear. The CJ springs are arched, so will give you a TON of lift. They will also give you a ton of axle wrap in the rear. The YJ springs will reduce the lift a bit, will ride better, and will flex like crazy.
Either way, you will likely need an anti-wrap setup for the rear, or invest in lots of extra springs and driveshafts.
Longer brake lines, re-route your parking brake cables, longer driveshafts (possibly with longer splines as well. Maybe even a CV joint for the rear). Your steering will likely need re-worked (the drag link will hit the springs, and the angle will be pretty severe). I'm sure I'm missing a few things.....
It MAY be worth it to you. Or, it may just be easier to get taller springs and stay spring-under. Or cut out the rear fenders for clearance (TJ flares, and trim the body to fit).
I think for what I'm going to be doing around here I may stay spring under, but I do believe I will be going with YJ springs regardless.
It sounds like it would be more cost effective to stay spring under since the biggest tires I will run will be 33's.