I would like to read what JB writes too. I have an intermediate length comercial Mauser action that is a .30-'06 just now, but I am about to convert it back to 7X57 (the cartridge it was designed for).
If I had a short action, I would say make it a 7-08 (i.e. 7X51). Intermediate or standard length action I would choose the 7X57.
Of course the 7X57 has it all over the 7-08 in terms of history and cachet.
jim