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depends on what camera you are looking at Eric - if something with small pixels, get a short focal length, if large get a longer fl.
You don't need the high resolution of a large aperture with DSO imaging, since the atmosphere will almost always limit you to maybe 2 arc seconds - even an 8 inch GSO scope will do much better than that with ease.
The mount looks like an excellent choice and i would suggest an 8 inch f5 (Bintel or GSO are the same I think), which will match well with DSLRs, smaller pixel cooled cameras and your existing array of uncooled cameras. f5 is way easier to set up and keep aligned than f4 and the low weight of the 8 inch scope will ensure that your mount is working well within its design rating, so it should be stable and track well. Whatever Newtonian you get, you will need a coma corrector - these will work a bit better in an f5 than an f4.
regards ray
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