I know that my friend Joel Dorleac really likes the FZH actions. They not only make them to the original Mauser design like both Mayfair and GMA do, but they use a different steel that is hardened to different levels for the various parts based on the original Mauser methods. i guess, if you're a purist, that would matter.
Best wishes with whatever you select, and do post about your build whenever you start it.
Good hunting!
-------------------- The Ark was made by amateurs. Experts built the Titanic.