After reading many posts, I have decided on the Benchmade brand to replace my old Case. However, I know next to nothing about the various blade materials (154CM, S30V, etc.), and would appreciate some advice. The knife will need to have about a 3" blade and be used often to cut (castrate) calves. The blade needs to hold an edge for long periods, with a little concern regarding corrosion. However, the blade is cleaned and oiled after each work session. Any suggestions on the best steel for my purpose will be appreciated.