I admit to being new, but a search failed to bring an overview of the dji models. At first I thought the choice would be between Phantom 2 with gimbal and Phantom 2 vision +. Now I see there are Phantom 2 vision+ v1 and v3. It's starting to get confusing. Is there a rundown of the models with their characteristics? I think a copter can help me in my business, but I have to import the unit and its components to another country and the cost of that is huge (2x) so I can't afford mistakes; I need the right unit first take. Additionally I am convinced I cannot rely on dji support so need a fair and responsive distributor with ready access to parts. 1) Is there now procedure to guarantee against flyaway? 2) I will need the longest battery duration. 3) Since the vision 2+ has gimbal integrated with camera, the fix is another unit at 600$+, so I prefer the idea of separate gimbal and camera. Is the Zenmuse reliable? Is there another good camera to mount that doesn't cost like a gopro? 4) Finally, are there other drones I should be aware of besides the dji?