I was at the store by me today and I asked one of the sales guys, a guitar player himself and band member, what would make an excellent inexpensive mic for vocals. He showed me an Audix OM2 dynamic mic. They cost about 100 dollars. I'm thinking of getting one for Charity, as she sings along on my PA to songs I jam to. I have a mediocre mic right now. Plus having two mics will be good.

Here is the link to some information http://www.musiciansfriend.com/pro-a...m-2-microphone .

You might want to check one of these out. They are supposed to sound better than the SM58.

I haven't tried on yet so I can't say how they perform in various situations, but the sales guy says that they are definitely real nice.

I hope this helps, in addition to the Shure mic info.