there are two short action surgeons. The RSR is the one I ordered, and the price was not much different than a stiller tac30, because it comes with a rail and the stiller rail is extra. The RSR is built heavier duty than the tac30. Double pinned rail, double pinned recoil lug, one piece bolt, stronger bolt stop just to name a few things. When I ordered my Surgeon action, they quoted me the lead time and delivered right on time. The bolt will need a coating, it comes in the white.
All the surgeon actions are designed for hard use applications. Benchrest actions are a totally different application. Do you want a benchrest gun or a tactical gun? Your components and gunsmith choices all depend on what you want. Have a benchrest gunsmith build your bench gun. Have a tactical rifle gunsmith build your tactical gun. For that matter, even the chambering. I'm not sure .260 rem is the best choice for a benchrest rifle, but then again, I don't know much about benchrest.
You didn't mention what actions you were considering. If you already have a donor winchester or remington you can use it. The problem I encountered with my winchester short action was finding a 10 round removable mag system for it, and finding a dealer with inventory of winchester inletted tactical stocks (Gene sears supply carries inventory of mcmillan stocks inletted for rem and clones and probably the best price on jewel triggers).