We get used to thinking in terms of images, and that's appropriate, but crappy audio drags down any image or sequence you may get, and no amount of skilled or creative editing will compensate. Oh, and onboard audio sucks. So, along with the mic, boom, and cable, invest in a Tascam digital recorder. Even a little DR-1, at $140 or so, will vastly improve your audio quality. Better, the new DR-60D will see you through in top style. You can find them for $300, and worth every buck.