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Hi Glenep. DSI is not very good choice for live viewing. First of all you will not see any colour on your computer screen with any camera. It will take minutes or tens of minutes of exposure before colour of the Deep Sky Object become apparent. So the colour pictures you see on this site are many minutes of exposure stacked. Your scope is F15 and about 1800mm focal length. You will need very sensitive (0.001Lux or better) camera to see anything at all, live on your lap top screen.
Only camera I know of suitable for what you want to do is GStar. Even with this very sensitive camera I would recommend that you get Focal reducer to lower your F ration and to get wider field of view. The image on your screen will update every 2.6 seconds on maximum sensitivity setting.
I got ETX-105 and GStar camera and I use it with Focal reducer. As for computer software I use SkyMap and it works well with ETX.
Other alternative is colour Starlight camera. I got Mintron MTV-62V6H-EX. With this one you will see different colour of stars live (red stars will look kind of red and blue stars will look blue-white). It is similar camera to mono GStar, but not as sensitive and it got many hot pixels (hot pixel will look like star in place where is not one). But even with this one you will not see colour on Deep sky Object live.
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