Jeff,
You are right to be concerned about audio. So many forget the importance of sound. The eye will almost always follow the ear. With the right sound, recorded on location, and in the post process, you can make someone believe almost any video effect.
Remember this comes from a DP of over 25 years so when I give this much credit to sound it is not lightly done.
As for cameras, I recommend the Panasonic line. Like the HVX 200, HMC 150 or the better HPX 500. The tapeless format it efficient and handy.
Compared to the price we paid for cameras only a few years ago these cameras are all inexpensive.
Paul Hudson
Lizardlandvideo.com
Phoenix Video Production