What kind of USB microphone do you suggest when trying to make an audio CD of your voice?

Aiight, here's the deal. Several of us (like 5 of us) need to make an audio CD of some mock court hearings. One person will play the Judge, the other will play the Attorney, the Prosecutor, and another will be the interpreter for a Spanish speaking person who can't speak English, etc etc etc, you get my drift. Ok, so 5 of us will be sitting around my laptop, talking into one common microphone, in order to make this CD. What microphone do you suggest we use? And any other suggestions will be great. Thanks!