the type of microphone and its pickup would be factors. generally speaking most vocalists use unidirectional mics, depending on your style and normal performance setting a high end condenser mic might work as well.
shure is pretty much the industry standard when it comes to microphones.
Shure - Professional Audio - Products
EQ, mixing, distance from mic, vocal effects (reverb / echo) are all going to be significant factors in your overall sound as well.