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I'd steer away from 640 x 480 sized chips for doing this sort of imaging. Mosaic work is an enormous task. Even covering a large active region will take a lot of mosaic panels. Another thing to look out for is Newtons rings. In mono light with high mag these beasts show up.
If you go with the point grey flea3, take a look at the largest sensor. That will give you real estate and perhaps even a faster frame rate than the DMK41.
To answer Gregs questions; the skynyx is a bit outdated now. The frame rate is high but it suffers badly from Newtons rings and is very noisey. That means a lot of processing to try and correct for the problem.
The 640 x 480 flea is best on planets and does require an powered adapter and well not suited for solar work. Perhaps look into the camera Peter has too. That is a Lumenera but not the skynyx variety.
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