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Stephen,
Whether an NEQ6 could be used or not depends to some extent on the image scale, for example using a DSLR for wide-field stuff, or even a lens say 100-200mm piggy-backed on your scope, yes I would expect the NEQ6 would be fine. But through a 180mm mak with 2700mm focal length, no.
The second thing is whether you use an auto guider, or not; for long exposures an auto-guider is a must-have in order to use closed-loop feedback to correct for a whole host of guiding errors - mechanical flexure in the mount and telescope, periodic errors in the geartrain, misalignment of the mount on the celestial pole, atmospheric refraction, and more.
Without an auto-guider just relying on the tracking of the mount won't work well enough for long exposures.
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