How much are you going to fly IFR? And locally or covering some distance? Prior to going 135 then 121 (both companies used/use Jepps), I bought a set of Jepps for personal flying. In my opinion, Jepps are far superior to NOS in several ways, but if you're just going to be flying maybe once a week, rarely going IFR, or you live somewhere that could require two area sets of Jepps, I'd definitely pass on the cost.