Clone of Lead Generation Website

Lead generation website to match buyers and sellers of services. Approximately 30 pages with large database requirement. Site must be secure. User registration, Login, Password protection, Bidding function, Escrow capability, Dispute Resolution, Case description, Bid communications. The functions of the site are similar to a freelancer's site matching service buyers and sellers but for professional services. The functions are somewhat different. The site must be designed with clean SEO in mind and should include blog sections and designed so that I can go into the site to make minor changes, insert new pages, and delete obsolete pages. I will provide all content. I do not expect SEO on this site but make it Search Engine friendly.