a decent mic would be a "sure 57 or 58".last time i've check they cost around 100$.
I think you can hook up any sequencer software out there to a soundboard.you just need to setup things within the software to make the soundboard work with it.you might have a easier way with cubase because the software would recognized the soundboard setup and everything would be ready to use but still there you might want a specific setup that you prefer with the soundboard.
NGXMusical Free Track Lib http://www.soundclick.com/NGXmusicalNGX