Buddy of mine replaced his leaking box twice. I convinced him to get a ff box if for no other reason than to avoid leaks. He wishes he got the stage 3 now, but it was a super improvement over the stock box.
I wouldn't bother with a box replacement though unless you change the pitman, idler, and all the tie rods too. The slop is all tolerance stacking from lots of worn points. Your control arm bushings should also be in good shape if you expect reasonable handling.
