Whats your budget?

If all else fails get an Shure SM58 as a reliable robust workhorse but there's a lot of other mic's out there at a similar cost that sound better to some - like I'm using an AKG "tripower" model (the number escapes me) which cost me 50 pounds sterling and to my ears sounds better than a 58.

You have to audition, preferably with your own PA. Audition without any effects or compression; your own voice through a PA may sound frightening without assistance but its the only way!

I think you're going to get a lot of replies on this one...