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Both are important, but I don't think there is sufficient difference between 102 and 127mm, I have had both.
If you want aperture, and for DSO imaging, then look at a reflector, a newt like the 10" f4. I know you've been into reflector-land and come back, but if aperture is what you want, then the newt is the scope.
Short wide-field stuff you have sorted with the 80mm. If you want the decision between the 102 and the 127, AND the 80 is staying as part of the package, go the ED127. Big scope though, nose heavy too.
Gary
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