Casio EX-P700
The EX-P700 is part of the Exislim line of cameras from Casio, which were designed as lighter and smaller than earlier models. The lightness of the camera is an advantage when you find yourself traveling long distances and holding the camera for extended periods of time. The camera has a filter thread adapter for adding on a scope and features a handhold for keeping a good grip on the camera once the scope is attached.
Canon PowerShot G6
The Canon PowerShot G6 is one of the best digiscoping cameras because you can purchase an additional wireless remote for controlling the camera. This gives you the opportunity to take photos from a farther distance and allows you to get closer. You can leave the camera sitting closer to an animal's nest and take your pictures without disrupting them or scaring them away. It also has a large viewing screen and threading for holding the scope firmly in place.
Olympus C7070
The Olympus C7070 was ranked as one of the best digiscoping cameras for its features, including the ability to program the camera and change the settings to take better pictures. It has a small LCD screen, but when viewed through the scope, it's more than enough. The camera also features threading on the outside of the lens for the attachable scope and it has a strong zoom for getting close to the animals.
Nikon Coolpix 8400
The Coolpix line of cameras from Nikon has long been a favorite among digiscoping enthusiasts, and since the 4500 model was discontinued, the 8400 has been the best. The outside of the lens features a thread for attaching the scope, and you can also custom fit the camera to hold a scope with long-eye relief. You can also move the camera easily while still keeping the scope stationary.