An ARB is probably the best choice for a locker. It cost's a little more but the ability to turn on the locker when needed is worth the extra price. And it has the added advantage of providing pressurized air. Limited Slips are almost worthless when off roading, they can be dangerous in on road icy conditions.
There is a locker for the made for the 8.5 IFS front axle (I gotta search for the manufacturer but I believe it was Eaton) it's not popular because IFS axles eat CV's regularly when coupled with a locker. And it isnt selectable which makes the turning radius suck.
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