C-gap is easy. The most difficult (non-optional) section is climbing the hill from Catalina to c-gap proper. I have run the back half in 2wd (north to south).
Chiva Falls can be challenging in a stock vehicle with a inexperienced driver, particularly with IFS. It is more challenging than C-gap, but still, not that difficult. I ran it a couple weeks ago with my mother, and she only had the urge to get out of the jeep 2 or 3 times. There is generally more wildlife along Chiva, and there are a couple options for extending the trip if so desired. It also has many more optional lines to take as the driver sees fit. But it is a much shorter trail than c-gap.
Chimney Rock is pretty tame, with really only one climb that makes you pay attention. Less used than Chiva, therefor it feels more remote. Good wildlife.
There are a number of trails around Helvetia, all pretty tame. This is where the Gunsite pass trip ended.
There are quite a few ranch roads on the south flank of the Sierrita's. All pretty tame. I have seen a herd of deer that numbered in excess of 35 in that area.
I will probably be around that day....unless I am burning some metal for Jeff.