to be honest up front, I never publicly list my best domains...
I usually do the opposite. When I know a domain is great, I keep it to myself and my potential customers (there are exceptions to every rule though)
However, one of the better ones (not best though) that I owned and sold was religions.org
DNF is a great community, and I feel that we do share a lot. However, it is unrealistic IMHO for people with large portfolios, to actually go ahead and list our best domains.
We are competitors after all
One of my favorite ones however, for now (favorite is relative) is the one *currently* in my sig.