Are you going to be keeping your 33" tires?
What's your budget?
If you're not going bigger than 35s or so and are on a budget, I'd just put a lunchbox locker in there. I have a Lock Right in my 8.8" right now and have been happy with it. Sometimes it bucks around tight turns but I just push in the clutch to stop that. For a more street-friendly version get the Powertrax No-Slip. If you're not going to go big on tires I couldn't really justify the extra expense of a Detroit.
If you have a bigger budget, go selectable. The ARB, Eaton E-locker, and Ox locker are all good--open when off, locked when on. The Auburn selectable is LS when off and locked when on, but not as good for BIG tires, I hear.