If you are looking for poetry being written today, there is no shortage of places to go, but finding what you are looking for (or finding the best of what is out there): that could take some time. At this time, the closest thing to a ranking of quality is: unit sales of books and the circulation numbers of magazines. Popularity defines success which is supposed to be somewhat influenced by talent and technique.
Here is an extensive list of publishers that take poetry submissions, shown alphabetically. If you link to the publication website, there are poems and links to poets via website, facebook, twitter, blogs, ect. Here is the list by Lou Crew (who knew?), a professor emeritus at Rutgers U. There are 866 publishers on this list.
http://andromeda.rutgers.edu/~lcrew/pbonline.html