I think that community wiki that ask for a best x questions should include all possible candidats for x as answers to allow everyone to rank them.
I don't see a good reason to have the x that the questioner starter proposes in the question itself as done in What is your favorite data visualization blog? or What statistical blogs would you recommend?. The alternative is done in What is your favorite "data analysis" cartoon? .
Having all possible x as candidates would allow the best x to rise to the top regardless of whether they come from the person who create the community wiki question.
What do you think?