I like two after-market main springs. "Lee's Gunsmithing Gunfighter set (Brownells or Longhunter) and VTI Gunparts has a reduced power main spring. I once knew who made the one from VTI but I've forgotten. As a personal preference, I don't like anybody's wire Rtigger/Bolt spring. Makes the action a little mushy. I either tune the T/B spring or use Pietta's T/B spring. Flat springs give the action a "crisper" feel.
Coffinmaker