Hi guys. Thanks!
I'm using a Swarovski ATM-80HD scope with the 25-50 wide angle eyepiece, the DCB-A digiscoping adapter, and a standard 3x zoom digital camera (it's the Casio EX-Z750, but you could use anything else with 3x zoom for equal quality).
The essential parts are a wide angle eyepiece and a snapshot camera with moderate zoom (i.e. 3x and not 5x or more), as these two components help to avoid vignetting. With this combination I can digiscope without vignetting down to about 1.5x zoom on the camera, and any zoom level on the scope.
Hope that helps.