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I'd choose based on what type of targets I was expecting to photograph. For example my ST7 (comparable application to the DSI) is great for narrow field deep sky imaging - small faint galaxies and the like because it's a small high quality chip, low noise, extremely high sensitivity, etc. A DSLR in comparison is not so suited so well to that, being more for the wider field colour imaging, daytime/normal photography, brighter objects (unless modified), etc.
Personally I wouldn't buy a DSI pro, I'd only buy the single shot colour one. Why? The single shot colour one strikes me as a great simple all-round colour astro CCD camera that would be easy and fun to use. The Pro with the filters that stick out where they get dust and dew, are manually moved?, doesn't fit in that "small, cheap, simple and easy to use" category so well and yet isn't of the quality to fit in the higher end of the entry market they're trying to fit it in. In the astro CCD line I'd go the single shot DSI or save up for a different astro CCD. Also, I thought the Orion equivilant was better with temperature cooling & regulation not just temperature reading like the Meade?
That's my opinnion at least.
I've always wanted a normal DSI as a simple "grab and go colour ccd" for my wide field scope. It strikes me as a simple solution. But I've chosen to purchase a DSLR first, for many reasons like the use of it for wide field imaging, high megapixel shots and normal landscape photography.
Roger.
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