Re: The SM58...
If you ND767 is such a great mic then why have I never seen them on a tech rider? If you are having feedback problems with a 58 then how about reaching for the eq and pulling out the problem frequency? Saying that a microphone is more prone to feedback then others it complete bullshit! Think about all the variables that go into a signal path to cause feedback! You have the venue, reflective walls, ambient noises, stage wash, response of the monitors/loudspeakers, response of the microphones, overall gain of the system, (gain is the actual cause of feedback). While your EV Mics may be less prone to feedback in a particular circumstance, they won't be in all situations.
With regards to what sounds better in its class.... What class are you talking about? "Handheld vocal Mics"? I have a kms105 and it sounds better on my voice, it is a handheld vocal mic, is it in the same class? Oh, and I can guarantee you that I will not let you use my kms105 for your band so YOU get the sm58s, therefore they are the best sounding mic that you'll get on my stage unless you bring a BE and an ME who is used to using your Mics, and that is only if you are the headliner that actually gets a sound check. While your at it, bring your own consoles and copper because you aren't messing with my eq curves that are perfectly rung out for my sm58s and my monitors with my monitor guy. I don't have time to reset my eqs for all the other bands that don't get a sound check.
Get it?!
That's it why the sm58 is the most popular, most accepted vocal mic of all time!