(This is from the Starry Nights forum, I thought we could help him out with his research

.)
I have a little project going to come up with top ten lists of objects
by object type. I'm hoping that this will be an interesting thread for
the observers here on this group.
There are no limitations on your list: just the top ten planetary
nebulae for each person, for your own reasons, which I hope you will
share. I encourage people with access to the southern skies to include
southern objects.
I'll eventually compile my own list based on a combination of my own
taste/experience and the comments of others. But that isn't
necessarily
the point. Hearing what others have to say is very interesting in
itself!
So, what are your top ten planetary nebulae and why?
Clear skies,
Greg
--
Greg Crinklaw
Astronomical Software Developer
Cloudcroft, New Mexico, USA (33N, 106W, 2700m)