Use pie-register plugin so that users can register and post articles.. you may also want to try the following..
Wp-Post Ratings
Contact Form 7
Paypal Donations
AJAX Comments
All in One SEO Pack
Category Order
Google XML Sitemaps
SI CAPTCHA Anti-Spam
WP-PageNavi
WP-PostViews
WP Auto Tagger
WP Super Cache
WP to Twitter
Login LockDown
Yet Another Related Posts Plugin
Also note, too many plugins will increase the load of your site, and don't forget the cache plugin as it plays a main role to reduce stress on your database requests .
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