For documentary work, you may want to consider a DSLR camera. The favorite at this moment is the Panasonic GH4. There’s a video about it vs the less expensive GH7 on this site here:
http://www.videomaker.com/video/watch/reviews/18520-panasonic-lumix-g7-vs-gh4
DSLRs have notoriously low quality audio, so even though a mic is in the camera, the audio quality will not be good. Use the camera audio for your scratch track and record the full range audio on an outboard device such as the Zoom H4n.
If you’re looking at a camcorder, there’s a ton of good quality cameras in your price range. Search this site or visit http://www.BHphotovideo.com and check out their offerings
