Im very familiar with the wheeling in your surrounding area (Potosi, MTNF Service Roads, Ft. Leonardwoood, St. Joe) and from what I've experienced, I'd say you could get away with the standard kit no problem. And with the 33s, it will be rare that you find an obstacle that will stop you.
But also think of the possibility that you might want to go to other spots one day, I.E, Superlift Offroad park, Badlands, and maybe even Moab one day, so the extra flex that comes out of the Superflex kit would be pretty helpful in these types of situations.
"Rigged for her pleasure"
Jeepless for now