I love kmc, and their product range is huge, with a wide spread of pricepoints, applications, and quality. The expensive/"high quality" chains tend to be for multispeed (10, 11speed) set-ups and lighter... even their cheapest chains are quality in terms of durability and tolerances.
My favorite for singlespeed and IGH set-ups is the kmc 410h-np. Old-school bushing construction is the difference; most manufactures have abandoned bushing chains, but I find them to be more user-friendly.