since you'll presumably be wheeling with your sas, do it right the first time...
i'd highly recommend a d60. they're bombproof. i've seen plenty of battle-scarred d60s in colorado, they're seriously burly. also, if you break parts off your d60, the aftermarket replacements are even burlier.
you'll need a hy-steer setup (crossover type). don't listen to anyone who sez you can just extend the steering link redneck-steering style. rockstomper, offroad solutions, and advanced offroad research all have quite a bit of experience with hy-steer and sas stuff...rockstomper might even be able to recommend or have parts, since they work with d60 axles and whatnot.
you're better off getting a new power steering box. ive seen a few adaptations using rack & pinion, they aren't very pretty, and rock ram steering will be much nicer and probably break less

.
you'll also need new break lines (the soft part that goes to the rear axle, and one for the front), but those are cheap compared to the rest of it.
you'll also need to take some pictures
-sean