Functional and Systems Analysis and Design of a Website

I'm looking into establishing an online presence that directly competes with an entrenched site and online community, NGW. NGW is an open and free site. It basically aggregates news, on a daily basis, from various online sources about a specific country: NGN. A relatively minor function is publishing news-reactionary articles from various hand-picked authors. In the process, it has amassed quite a following and engendered a community of users and followers. I myself use this site quite often. However, I feel the site is getting quite antiquated and can be made better, more modern, with an improved user-interface, information architecture, and employing the best techniques in social networking, engineering, and integration. I'm looking for an individual or, preferably, a company that can effectively "decompile" the site and its business processes from "soup to nut" and reconfigure it, from the ground-up, using modern and efficient techniques, into a much better website that allows and enables a growing community and a future seamless "organic" growth. Please note: I'm not currently looking for developers or web designers; their skills would be much needed later. For now, I'm looking for someone or a company who can elicit and construct a high-level view specification of the the final site, to be turned over to web developers. (NGW: [login to view URL] ; NGN: Nigeria)