Forget the colour one Craig. It will be less than useless. You need to image in mono and the DSI is not necessarily your best bet. You want something that will snap a lot of frames in a short time frame. 60/sec sounds about right
but you could get away with 15.
The only place I see the DSI beating the DMK is that it is a true 16bit camera and you would also be able to use it for Deep Sky stuff (though the DMK is no slouch there either by a long shot. I snapped a ripper eta carina a couple of months ago).
And you can forget about using Registax with the DSI. Yes you can do it but the DSI saves as Fits (in 3 different formats
), Tiffs, bmps or jpegs. While Registax will handle them it much prefers avi or lots and lots and lots of bmps.