Geodesic Classifieds/Auction Expert Needed

Geodesic Classifieds/Auction is already installed and we are beginning to reface it. However, we would like to make the following changes and enhancements. 1). We'd like to change the flow for registration a bit. We want to charge for subscriptions and then allow the user to browse as a buyer or post as a seller (with listing position/highlight fees at posting time and then commission percentage fees charged upon a sale). 2). We'd like to have a custom add-on application that allows our users to have storefronts on facebook and myspace and light announcement feed to twitter. We'd prefer someone who really understands the Geodesic Classifieds/Auction application.