Thanks for all the replies everyone, "sorry Steve" lol. In light of all the info, and the fact that our offroading is intended to be moderate. You never know where you just might wind up when you go exploring, so I think I'll just save up and put a limited slip in both ends at the same time.

I'm going on 72 and am not quite as adventurous as I used to be, but my heart is still in it. I will probably always want to see where that road goes, wonder whats over the next hill, hey lets go see whats over there, and so on.

So, many thanks for the comments and help. This is a really great site.