Need Advice on Software Choice/ Positive Media Network

ADVICE WANTEDWhat content management/community blog software is most perfect for us?'The Good News Network':http://www.goodnewsnetwork.org, GNN, since 1997 offering positive news stories from around the globe, is in the process of reorganizing. The old html web site will be reconstructed to include data base, blog, and other tools for building community and helping to change the world. What software should I employ?The software should offer:-registration / log-in to join;-ability to post comments after stories;-editing of comments after posting (by author);-rating system for comments (ideally w/ naming options);-reader's choice to view comments chronologically, or by ratings levels;-member to member messaging, anonymously;-calendar;-password protected page for GNN team to organize/collaborate;-tweak-ability for developer to choose fonts, adjust layouts, tweak themes/blocks. I like a spare artistic look, 'such as':http://imagicweb.com:8080/ambient/index.php?theme=AlmostNothing/ -bulk email tool - - ability to email thousands, sort by groups (like by state), and send to sorted groups-individual user pages keep track of comments written, replies to comments, content creation tool-I envision a tool called 'start a group' that creates a mini-community with unique page (users interested in kids' education can start their own discussion group); members of group messaging each other in various ways.Background on Developer Needs - I use Earthlink for hosting but could switch (their biz acct is 20$ per mo.)- I want to absorb six years of old html stories into archiveDEVELOPER WANTED:-A Maryland web developer has offered to work for free: works only in 'PostNuke'.-Another developer can possibly work for a fee of $1,300 in 'Civic Space':http://www.civicspacelabs.com software.Ideally, I will pick the best software, regardless of developer concerns, then, attract a developer who could set up the site for a cut of profits in the future and/or small fee upfront. After the initial set-up of the site, the developer could be available by phone, consulting occasionally when problems arise. (News and graphics editors would upload all the new content without technical assistance)._____________Please consider lending aid to me as I decide what foundation to build on. I want code that can GROW with the business! Thanks for reading.