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I would vote for the Horsehead, as have others.
It requires a perfect sky, and the emission nebula vs dark nebula contrast on the two sides of the object is usually a matter of comparing a black section of sky with a section of sky which is a little less black!
I have also seen the brightest portion of Barnard's Loop, in 10x50 binoculars. Extremely hard, even in an excellent sky and with well coated optics.
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