Rugged Rocks sells the Armada/Titan RCV axles for $2k.
I have looked at scenarios like the R180, I would rather have broken CVs than a broken front diff. I do have the M205 in front and even then I'm skeptical since I've read about Titan and Armada front diff failures as well, but I'm also going front locker so that should alleviate some stress from the diff itself. There was a trail I hit last year that had fine sand and I don't think I would have accomplished it with just a rear locker either. Maybe with momentum and recklessness I might have overcome it. I'm literally overbuilding my rig just to accomplish that one trail
Then will move onto other trails after that. My build is based upon the quote from AvP & George Ellis, "It's better to have it and not need it than to need it and not have it." Otherwise, I do know that the "driver mod" is better than just throwing money at a "problem"