Hi & welcome to IIS.
That depends on how 'deep' you want to go. With an 8" scope I would imagine it would do great on deep space observing. Seeing as you would use low mags for most DSO observing, a motor driven mount is not a necessity, but it's nice to have. When your looking at planets at high magnification, then you might class it as a necessity.
After saying that, aperture rules for Deep space observing! Get the biggest scope you can afford.
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