When you talk about using a manual alt/az mount with a long focal length, narrow field of view Mak, aren't you overlooking how difficult it will be to keep a target in view, given the magnification these produce?
I'd imagine the combination would quickly prove frustrating, unless you're prepared to also spring for some expensive TV Ethos or Explore Scientific, 100 degree eyepieces.
Personally, I'd pick a goto SCT like the Celestron Nexstar SE series - prices on the 8" are awfully tempting at Andrews and Bintel at present and the extra diameter will give you a much better view of the objects that it's tracking.
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