That 4" spring lift will likely also require a SYE and new drive(prop)shaft.
How many guys do you know running Jeeps over there? Not those British knockoffs,

real Jeeps? Try and find a decent Jeep club and see what they are running. Most would welcome you to a ride along. That could help you decide what you want to end up with. Going in stages is a good plan because you may find happiness before you get to stage 4 of your build plans. Don't forget you'll need shocks for any of the spring lifts you choose.