What I've heard from the Isuzu crowd is that the D44 used in Jeep Wagoneers is the one to get. Just about the right track width and strong enough for most people's wheeling adventures. Toyota is a good option, but seems like there are more people looking for them and demand equals higher prices.
When it gets into custom built front axles like a ford 9/dana 60 you're talking about a whole different ballgame. Sure it can be done and is done, but at considerable cost, probably more that I've spent on any of my LUVs total.

Now what would be fun to me is putting a front axle in the rear and setting up 4 wheel steering.
