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For DSO imaging, the resolution provided by any reasonable quality scope above about 6 inches aperture will be limited by the atmospheric seeing in Australia - to about 1.5-2 arcsec. Bigger scopes cannot do much better unless they have true adaptive optics and even then, that only works at near IR and for quite small fields of view.
Bigger scopes gather more photons and can provide better SNR - provided the pixel size is matched to the focal length. It is pointless to have a large aperture if the angular size of the pixels is so small that sensor noise overpowers the small amount of signal that actually gets into each pixel.
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