You can get a very good action just by doing the minimum to it if all is true from the factory.
All of my comp guns started out as either Rem 700 VSSF II's or Sendero's, as these stainless actions are very good right out of the box.
The VSSF II's both needed more work than the later bought Sendero's, in fact the actions were within .001" on spec to the centreline, the short action VSSF II's had .004" and .005" off the centreline and all surfaces, internal and external needed to be blueprinted.
All of my Comp guns are built as switch barrels and this is what I recommend, whether they are for hunting or comp.
I really like my switch barrels on blueprinted Win Midel 70 actions as well, lightweight and in 3 different cals they are very versatile.
Anyway, I don't think you need a custom action to get a great accurate rifle if the work is done correctly on a factory action.
Cheers.