If you are sticking with factory offerings, then 1-Rem. 2- Savage. 3- Win. Why Rem. Good strong action. Aftermarket parts are widely avaliable. Almost every accuracy smith on the planet works on them.
Now.....if it were me......custom all the way, baby!!!!! Cost wise, after spending $$$$ on the factory action, buying aftermarket parts (recoil lugs, firing pins assy or even a new PG&T bolt, ect...ect..) having a smith tune it and true it, the cost is nearly the same as a full on custom. And, after cycling the custom one time, the rest of the money differance melts away.....trust me on this.
You can even bypass the 3 to 6 month wait from the factory by getting a used one. Lots of them on BRCentral. Or buy a new one from some of the shops that stock a few all the time, like Bruno's.
Good luck on the build!!!