Develop a flash or ajax solution for us

Our client wishes to develop an elaborate question based "product chooser" for his web site. We will require the chosen provider to sign a NDA for this project. The project will require ideally a php and mysql solution running with ajax to make it look good. One question will result in another depending on its response until a final product is shown to the user. Admin area will need to be built so that additional products and questions can be added. If you have built something similar please supply a link - only supply links to RELEVANT examples, not interested in seeing huge lists of "we've done this and that all with php/mysql" etc - irrespective of the provider we will just ignore such obviously copied and pasted responses.