If I were you, I would not go to Spring Over Axle (SOA). I would go for a lift kit. SOA will give you a smoother ride, but then you have to worry about axle flex, and you will need to fab many things and weld quite a few others, which, from the questions you are asking, I will assume you dont typically do...
Lift kits will typically have everything you need to lift the Jeep, so it will be less of a headache for you. And I would DEFENETLY stay away from shackle lifts (unless limited to no more than 1" longer shacles than what the stock shackles are). Keep in mind that for a shackle lift, you need twice the length of the lift, which means that to lift the Jeep 4", you need to extend the shackle by 8", and that's not just ugly, it's DANGEROUS.
If you want to start simple, try a 1" body lift (I would not go higher than that on BL either!), and maybe combine it with a 2.5" suspension lift. If you dont wheel much, that should clear 33's without need for a SYE or Tc drop...