Business Directory - Social Network Style

We are looking for a freelance experienced Web Developer to join our team. We are small group of web and graphic designers and urgently require a developer on standby to build back end solutions of sites. This would be project based work when we require assistance. We already have a clever CMS program that enables us and our clients to manage small mirco sites, text and images once we have designed and built them. But we are limited with any kind of complex data-basing. In essence we need a developer to help to take us to the next level so that we can build bespoke solutions for our clients. We potentially have a huge project that should get the green light within the next two months. In brief - this would be small regional business directories. We already have designed the site but we need back end control to be able to post company details to the site. The users can search the directory by list, filter, search or via a clickable map. On ‘click’ a detailed profile page is displayed with three levels of subscription on listing. Our clients should be able to login to the site and amend their own information also they are given an option to add associates ‘related companies to their profiles’ like a friend list on facebook, with a short passage on how they are associated. They can also use an RSS news feed to post news that appears in a news box on the home page randomly scrolling from latest articles. Subscription would be via request. We don’t require an online subscription management tool or payment software. We would require account control in an administrative CMS to add, remove, edit profiles, assign passwords and usernames. This site should be clone-able as we will potentially have loads of these mini directories. In the near future we would then hope to launch a mother site that would be able to search all of our various smaller directories so ‘one database for all’ may be appropriate. Clearly this is a very vague brief and we will supply a full brief to the developers we deem to have the best prospects. We understand is difficult with the lack of info - but for now we would still like you to estimate a cost to build this application and submit examples of other work you have completed. Please note developers in the UK and UK/KENT would be the most desirable.