do you have a descent sound card? if you have a $100 dollar mic then i'm sure it is a condensor mic and that it is being run into a mixer or pre amp before it runs into your computer.

then...

make sure your volume levels are all adjusted correctly. make sure your volume isn't clipping. once you get all of these settings done correctly, you should have much better sound quality. also make sure you are using a pop filter. when you record it should sound really good with all of that done. then you can mess with the few knobs on your mixer (if it has them) to adjust the EQ to make ya voice sound a lil better.

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dren a.k.a. dren rapes u