Looking for an inexpensive mic for my Mac

[the_poochies]

I'm doing a radio podcast for a friend's Web Site and I need a microphone to input my voice on the podcast. I know that the Mac comes with a built-in mic, but I wanted something that doesn't sound like it's coming from a built-in mic.

If it helps, I have a Griffin iMic so a 1/8" plug would work on my Mac.