The range on after market/upgrade parts for bolt actions is (almost) limitless. So as to the body, use what you like the (external) look of, and if you are stripping almost everything- going cheap (shouldn't) harm the build itself.
As to parts, looking around will get you best deal, but fewer or single store will keep postage down. There is a "where to buy" thread which is really useful.
I know that is all quite general, but hope it helps