My concern is future proof parts for future lift heights.
Yes. The other thing to keep in mind with the shocks is that they are a wear item. Depending on how long you go between your stages of lift, you might wear out the shocks and end up replacing them to fit the next stage. The control arms, sway bar links, etc are buy once at a high quality and keep them for the life of the Jeep.
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To add to this, there isn't really "future proof" with Jeeps, they aren't computers.
My advice would be to determine what tire size you are wanting to run, and build for that.
You mentioned you have a set of 33's, but maybe you want 35's down the road.
There are so many spring/shock combinations out there.
A 1-3.5" Fox shock might work for some 3.5" springs, and not others, because you might end up gaining more lift than expected from a spring.
That's why I have relocation brackets on mine (as well as providing ground clearance), the rear shocks are a bit short without them on my specific springs.