Talented Web Programmer

Can anyone recommend a talented web development firm or developer, preferably one who specializes in social web applications? We are a startup company that is well financed through angel investors and are looking for a very talented firm/programmer(s) to create our custom social web application with unique features not found in white label social networks. The firm/programmer(s) needs to be an experienced PHP programmer, who has fluency in AJAX and MySQL.

We initially underestimated the complexity of our proposed site and hired two "top" web developing firms, who were unable to create what we require. Now, a year after our planned launch, we are having to start the programming from scratch. We already have a sixty page technical scope and detailed designs of what the site will look like how it will function.

Location of the web firm or programmer is not important to us.

We appreciate any recommendations you can offer us. John