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As I am also intersted in deep sky photography, is there any benefit in getting 2" filters instead of 1.25" for deep sky stuff?
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Not that I can see John unless at some point you are going to get a CCD camera with a really nice BIG chip.
No benefit for the ST 7 size range of chips.
I don't think there would be any benefit of using filters with the DSLR. For one you wouldn't get any better resolution due to the baayer matrix masking out pixels that differ in colour to your filter. You may, and I say may cos I'm only thinking outside the square here, not get less sensitivity if the red filter for example has a different wavelength spread than the Baayer red filter.
As I said I can't speak with confidence about these but they are two of the things that immediately jumped to mind.