All you ever wanted to know about audio for DV and details on each type of mic, can be found at (www.equipmentemporium.com). They even have a special section on audio for camcorders (see sales).(posted 9021 days ago)I bought one of their special XLR to miniplug adaptors and a AudioTechnica short shotgun mic. The results were amazing with my VX-1000.
I wouldn't go with a DAT unless you really want to spend a lot of time with synch in post (don't forget DV doesn't really have frame accurate timecode... besides I don't think there's much difference between good DV audio and DAT... put your money in good mics.
For interviews and docs, the BBC uses a wireless lavalier on their subject with a short shotgun on the other channel... n