Well, I want to film black crows (they are kind of shadowy ). I must say that I'm after a natural look.
I don't like the mount on the Dahua either (the cable seems only to go trough the mount). That is more flexible with the Grandstream (probably?) and ACTi. The ACTi could even be mounted on a Tripod. 20fps at 3mpx of the newset Dahuas would have been a benefit, but it seems Dahua is getting off this list. Maybe I put Hikvision in the game instead.
I'm not sure if I can get lucky with a fixed lens (It would be a bit of speculation as I don't have any experience with network cameras and their focal lengths). Hard to say. On the other hand I don't want to distort the crows with wide angles.