SAS = Solid Axle Swap.. it involves LOTS of fabricating, being able to think it ALL the way through, along with th eknowledge to get the proper parts, for the proper reasons, and making sure you dont underbuild it all. Plus, you have to have a rough sense of mathmatical work in makgin sure its all cut and balanced properly for steering alignment though.. thats just the tip fo the iceburg. Just wait for a couple of the SAS guys to poke in, they can give you the run out..
But for yoru application, I woudl recommend a Superlift ($1200+), or an RCD ($2200+++).. the Superlift keeps the torsion bar assembly, while the RCD converts the torsion bar setup to a coilover...
Long term, alot of people usually recommend an RCD< but you really do have to sink ALOT of money into it to get it "just right", whereas the Superlift works as well as it should, and is a simple bolt on.
Its all whatever you think you would like.