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I was presented with this exact same quandary recently when a group of students from Sydney came to my observatory in Broken Hill at full Moon.
I found that there are still some deep sky gems that still look good.
1) Regardless of the Moon, The Homonculus still is well defined and looks great at medium to high magnification.
2) With an OIII filter in my 31mm Nagler The Key Hole Neb still looked stunning.
3) We observed Regor with my Rainbow Optics Spectroscope. The emission lines from this Wolf Rayet star are amazing, regardless of the Moon.
4) Saturn is so intrinsically bright that it always looks great, Moon or no Moon.
5) Esb 365, a Carbon star by the Cross still looked blood red.
So you can still observe deep sky and on many other occasions I have imaged storm structure on Saturn, even with the Moon in the vicinity.
I think the quality of the seeing is more important than the phase of the Moon.
Cheers
Trevor
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