If I were going to go to the expense of having a Remington worked on, I would seriously consider something like a Stiller 'predator' action, or one of the Borden 'alpine/timberlines'. Don't know what trueing and squaring cost in the States, but I reckon these actions would compare very favourably and have all the work already built in. Add a magazine box, jewell trigger and Lilja barrel (tip - look seriously at Bartlein barrels) and you are ready to go.

As for CRF, I don't know who builds the best Win '64 type actions these days, but there are a plethora of Mauser clones that are very well machined, but pricey. I would certainly look at the Ed Brown too