I assume your talking about upgrading the JK.
Personally I would look at 4.56's. That's enough that even if you go to 35's you should be fine, but low enough that it won't be too much for 33's. Regearing isn't to be tried by the faint of heart either.
But is yours the Manual or Automatic? That might affect some opinions for it.
For used, I would look around for someone that is planning on '1 tonning' their JK and buying their old set if it has a better gearing that you want.
For XJ's/YJ's/TJ's the cheap upgrade for us 6cyl folks was to buy a set of axles off a 4cyl of the same model. Instant 4.10's with bolt in wrenching.
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