There are a few edges (such as spine of the akragaka) that are absoloute first priority, and after those there are edges that depend on who's in my range. I'd onlty take steal sight if I was fighting shamans often, and even then I'd want to take sightbinder first or possibly resistant sight rather than the two of them. For fighting flail specs or dirt-happy warriors I'd sooner take shield eyes. Having lost a 19 charge weapon/character to dirt/disarm once I also no longer stick around in a fight after being dirt kicked/disarmed, hoping for blindness to land is far too big a gamble.