I've got 3 sm57's and wouldn't mind having more. I don't use them on vocals though, you'd be better off getting a sm58 if you will use it mainly for vocals, because it's the same thing as a 57 just with the built in pop filter. The 58's are great for metal vox, imo. Sm57's are all I usually use when recording metal guitars, snares and high toms.
Edit: Coincidentally I was in another forum and someone had started a thread on this same article. Some linked
this picture of maynard to see if anyone knew what mic he was using live. Someone said it was
this mic. Looks like it too me, and its only $200.