Im looking to purchase a Crowning File, I'm somewhat new to Crowning, but have learned to care for my guitars from a good Luthier who is no longer reachable. Does anyone have any thoughts on what a good first Crowning tool would be, one for a variety of guitars? I'm well aware that Fret gauge has a lot to do with what file, but if there were one, and not a three sided file, triangular file, which would you recommend? So far the StewMac Z files are looking good, but each one seems to have a weakness, and they are quite costly. Any thoughts?