I'm building an authority domain and want to keep my links as clean as possible i.e. higher pr links authority links. Right now I have an official Wikipedia link exactly related to my niche. Only problem of coarse it's nofollow, but I figure it's still worth something since it's on Wikipedia. My question is, I want to start building higher quality backlinks, and one particular thing I want to do is submitting to article directories. Now most article directories, except for ezine and others the page you create the article on is not the same pr as the home page. Is it still worth me putting an article on that site? If it has a PR 4+ homepage?