Since you said "build on", the same choices for a great performing action exist...in no particular order. All will allow prefit match barrels which is really the point of any build. Accessories and parts will vary so decide what you want before choosing the action.
Savage SA - older versions like the Stevens 200. See EE for a very nice option (not mine)
Rem 700 or 783. The 783 continues to be my fave factory action to build a LR tack driver. The HB version is the best of breed.... look for the factory oversized bolt knob as a clue. Swap out the firing pin spring as that is a common flaw from Rem.
Howa/Wby Vanguard... very well made actions that are underrated.
Tikka T3
All will work and if you do some shopping, you can find for reasonable pricing. I would not want a fancy and expensive factory rifle cause you will likely get rid of alot of parts. Factory barrels are hit/miss and if you really want consistent accuracy, you are going to change the pipe sooner or later....
Jerry