Looking for the perfect cameras for Real Estate Video Shooting....

I own a company and need to purchase 20 cameras and train individuals using these cameras. Want to get as much bang for my buck. Need a camera that shoots great with difficult contrast situations. Pretty good in low light without giving up daylight quality. Need a camera that has a simple manual aperture ring. Any help will be greatly appreciated. I'm very familiar with the Canon 7D but would like a VIDEO only camera if I can get it for less. Would love to spend less than 750 per camera. Looking for a good discount buying many cameras at once. Thanks. Steve