Its all pretty much going to be custom, the whole sub frame on out. you can armor it as you see fit as well.
If you look around the jeepspeed section of NAXJA there are a few people running a TTB setup. Might be a easier option if go-fast is what you want. But then again look at the KOH cars, they're almost all running strait axles and do just fine in the high speed sections.
If you were to be willing to fab up a IFS setup, ditch the struts go strait to coil overs, you'll get all the travel you want. RVC uses a CV joint in their axle shafts, cant say ive heard of a broken one yet, OEM CVs get trashed quick in a lifted off road vehicle, get something that is designed to do what you want to do. For the diffs you could use the d30 center section out of a liberty, IIRC there are IRS D44 centers out of Corvettes as well, also im sure someone out there makes a ford 9in IFS/IRS housing.
If you want something for light trail use what you have is fine, add a locker to one end and call it done. If you want an IFS rig get a Tacoma, it'd be cheaper than trying to turn your XJ into one.