How much am I looking at for this type of site

[NNH]

Say I wanted to make a site similar to this one...

http://www.clubplanet.com/

I'm referring to the overall architecture, not the content. Ability to register, a forum, news articles, classifieds, etc.

Assuming I have a lot of content and the layout and graphic design is already in place, how much am I going to spend to implement/update/maintain this type of site.

Thanks.