I don't think it would be that hard in post if you used a portable rig for audio( http://pro-audio.musiciansfriend.com/recording/portable-field-recorders). Of course, like you said, another $100-300 for the unit and then a clapperboardkinda sucks. I REALLY wish I would have bought this class for $79 or something like that (it's up to over $140 now)on using your camerafor video. He talked about all kinds of stuff like this and how to work around it in the free sections. Oh well.