Over the years Katia used several different gears to sing in SL or Live around town. Here's her current set up:
Where my Hubby and I make music. His mess to the left, and mine to the right :)
Alesis 8 channel mixer - simple and efficient.
Not sure I like this, but it is connected and I use it at the moment.
This is an extra step. I have it connected, but you can go straight to the mixer.
This is pretty much all you need ( not necessarily in this quantity) One Mac, a Mixer, a Mic and a MP3 Player.
This is the one I am currently using, works well.
I have and had many Mic's but along with the Seinheiser EW100 this one is my favorite of all times.
My two favorites. The Audio Technica ATM 4050 and the wireless Seinheiser EW 100