Decent USB microphones? No. Get a real microphone and preamp.
Quote by Godzilla1969
I love you, Muphin. You have great taste in music.

Quote by Pacifica112J
Muphin > You

The Cooperation
The disadvantage is that you can't improve your sound very much, and it's difficult to add multiple ones without causing some latency issues. But look at Samson's offerings (CO1U and up) and the Rode Podcaster.