I'd vote for lockers front and rear, ARB's are nice but not necessary, and would not get the Limited slip package for the front or rear. I'd suggest upgrading your front end to 26 spline package and get a steel axle housing [Searching on those two topics will get you specifics] no matter what set up you choose.
Good Luck,  -Eric
Well, Eric, If you're not going LSD, and you think ARB's are unnecessary, what the heck is left? With ARB's, I know exactly when my diffs are locked, and when they are open, and I choose when that is. I agree on the steel and 26 spline, though.