For $400 - $500, you could buy a complete audio rig (Sony M10, Church Audio CA-14, 9200 preamp). With this, you can record directly to your audio recorder in case you didn't want to do video on any specific night, or you could record into the audio recorder or video recorder with the mic/preamp combo. Obviously, if you used the audio recorder while recording video, you'd need to synch them later but that's simple if you have the right software, like Vegas.