Time Machine Website

I am looking for long term programmer to work with me in developing my idea of a time machine website, a database driven site based on user-submitted photos of particular places in the 50 US states, organized by place, and most importantly, time.... (A user would be able to search for photos of a particular place, landmark, etc and a query would show all pictures of the target, arranged by year, (hence the time machine) I own 50 separate domain names to which I would like to apply the database and design after the first is developed, so the design has to be made to apply to all the sites independently.... I need this work to start immediately, and the successful party must be able to work both independently, and with me when I am able to work with them. I am looking for someone proficient in both the database design/functionality of the site, as well as the graphic design/presentation. All candidates must have samples of their work and be able to start immediately. I will not pay any money upfront as I have already been burned from that, but I will distribute pay accordingly as the project gets under way, with the final 25% payed only upon completion of the project.