http://auphonix.com/bestfilter One of the most vital pieces of kit you should have when you want really good quality sound is a pop filter. Without one your vocals will affect the microphone and cause a really unpleasant popping sound.
A pop filter placed in front of the microphone totally removes this problem. Your sound will be as clear as anything.
It isn't the only thing you can change to ensure great sound, but it is simple and it is important. Don't mess about with this. Even if the popping effect is minimal your audience will know something is not quite right.
