regearing my XJ

I am working on regearing my XJ in the comming couple of weeks.
I have already purchased 4.10 gears for my dana 30 in front, and im looking for gears for my Chrysler 8.25. I'm running 32"s with a 4" lift. Do you guys recommend a locker in at least the rear or a Limited slip? I do go on the trails once in awhile, but this is my DD too. I have gone trailing with my stock 3.55's and open diff's on front and rear and i still do pretty good...If i should put a locker or Limited slip in the rear (and for financial reasons, i would only do the rear) what should i buy that wont break the bank? Im trying to use as little money as possible buy still i want longevity and quality.

Thanks for the help!

Powertrax lock-rite for on the budget. Powertrax No-slip if you can afford it. Save yourself the labor and do it all at once.