If you are planning on any serious wheeling and anything bigger than 38's, then I'd do the Dana 60/14 bolt swap. Much more strength, better brakes, infinite wheel choices, and immediate parts availability.
If you have a pile of 715 axles laying around, then run what you have until you run out of spares. Doing the upgrade Jon posted will work, but the time and effort expended in my opinion would be going in the wrong direction. I've hashed it over about a million times in my mind and on paper, and finacially and mechanically, its better to swap axles in the long run.
"Free advice is worth what you pay for it."™