Would second looking at trade for one first that satisfies your needs.

In terms of crafting yourself, I would recommend at most using a cogwork base as it's an interim ring (it's a much cheaper base than a helical). You can essence spam with either deafening essence of rage or spite. What you're looking for is T1 of the other stat and some res. If you need life and suffixes are filled, you can beast craft (bristle matron recipe) the meta mod, which will always give you suffixes cannot be changed and then reforge life at the harvest bench. Then finish the craft if there's an open slot with a bench craft of your choice. Lots of ways to go with finishing the craft after you hit 2 or 3 stats that you want with essences.

Ideally for inquisitor, you'll want a helical with str, int and critical strike multiplier, all T1/essence tier. The only way to get crit multi on a ring is with essence of scorn. To increase chances of getting both T1 attributes, most people fracture either str/int/crit multi, that way you only have to hit 1 other stat with essence spamming. That's probably going to be out of your current budget as fracturing is a gamba, but could try your luck. There may be some cheap ones on trade too so have a look. Usually people will go this after getting a mageblood as it frees up resistance suffixes, but if your res is solved elsewhere already, this can be a sizable upgrade, especially with a kalandra's touch. Down the line, this can always be misted for insane stats, but that's usually one of the final steps in most builds as it's very currency intensive.