When setting up a SA, I like the "Lee Gunslinger for the main spring and a Pietta Trigger/Bolt spring. Personal thing, I don't like wire T/B springs as to me, they have a mushy feel. Pietta flat T/B spring feels crisper yet lighter than a USFA or Uberti spring.
Coffinmaker
PS: VTI also has a rather nice reduced power main spring. Both the Lee's and the VTI main spring exhibit very little "stacking."