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Hi Ben
1. from images published here and elsewhere, both are good scopes. C11 has better resolution than C925 for planetary work, but most of the time the atmospheric seeing will ensure that there will not be whole lot of difference. Deep sky capabilities of either will be a bit limited by the long focal lengths - a focal reducer would probably be a good idea with most astro cameras.
2. get the heaviest/most accurate mount you can afford.
3. most of the time you will not need a Barlow, but for planetary imaging, a good quality ~3x Barlow is needed - get a good one.
5. edge seems to be a successful technology, but pricy. if you go that way, check that you can get a compatible focal reducer.
If you are set on Celestron, maybe a reasonable starting point would be a DX mount with a 925 (edge if affordable and if a focal reducer is available). that should give you a versatile system. Regards ray
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