Build a Website

I currently have a website using WordPress as a CMS. Our site has grown in users and we're doing quite well, but we've reached the limit of our capabilities. We're looking to hire a PHP dev who can implement a number of features to our website. These features include: File uploading with the ability to tag, categorize, and add details to the upload. On our gallery page we'd like to implement search and filtering using the data entered at time of upload. We'd also like the gallery to paginate, we currently have a hard limit on what we display, only displaying the most recent 300 uploads. We currently have our uploads open in a new tab when clicked from the gallery we'd like them to play in a lightbox instead. There are other tweaks we would like done but these are the main things. the most important feature from an administrative standpoint is an easy way to remove content directly from the gallery and ban offending users while logged in as admin (wordpress admin). We would like to be able to click an upload from gallery and see a button that says "Ban user", which will ban the user and remove all files associated with the user, and log the ban. We would like this system to allow us to add a comment as to why the ban was instituted, and for this user to see this remark on a "You have been banned" page when attempting to access the website. Please let me know who you have that can do this for us, and if possible, supply me with a quote and time frame for this project. The website is [login to view URL] if you'd like to check it out.