I'd say get one for the rear first (don't know your info though). I feel like a rear locker would be a bigger benefit over a front if you were only to have one locker in your rig.
And honestly, take what you hear people say about a locker in a DD with a grain of salt. I concerned about it until I actually got one. It's not that bad. You just have to change your driving habit a bit and listen to a little bit more noise.
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Current Stable: 2001 WJ, 2006 WK, 2006 TJ