I have done similar websites before. What you are looking for is a site that has a CMS (content management background) with a professional, yet lax look and feel. The main thing for me is not the design, I can do that very quickly for you (within a week), however, the content will take more time.
Overall, for the $650 you will get a site with a built in forum, articles (great for gossip or celebrity stories, health and fitness, etc), built in arcade (I know some owners of flash game sites, and I can convince them to place their games on your site), downloads (for music, stories, games, etc that they can download and discuss).
If you have any questions please let me know. Also with this bid I have included one year of hosting if you need it.
Thanks,
Mike