Provision Software I'm Planning On Building A Country Portal Website? Should I Utilise An Enterprise Portal Software?

I'm planning on building a country portal website? Should I utilise an enterprise portal software? - provision software

I plan on a regional portal for a country to provide services for news, business, directory services, web communities, social networking and dating services include, among other things, to develop. This site is similar to rediff.com India.
Sites like these are better developed from scratch or better with the software company portal made available? Could you some examples of the major portals of software for this kind of project?