Spring Over isn't a cheap alternative. Trust me on this, i've done it on over a dozen rigs and it's not a good beginner project either.
I don't recall seeing you have any trouble based on lift height. Your jeep is plenty tall. If it were me I'd start by perfecting what you have already.
When $ allows you'll need a Slip Yoke Eliminator and new rear driveshaft. This will get rid of that drop skid plate you have for your current lift.
Ditch tube steps on the sides as you already have sliders.
When you've got this stuff done and want more capability I'd start looking at lockers, but MY Personal best advice would be wheel what you have for a while making small changes.
OH AND HAND THROTTLE if you want to make taking off on those hills easier.