Design and building of CMS based website

I will want a website designed for our company. Website shall include products in three main areas: Vehicle Tracking, Electronic Security Systems and IT Solutions. Some aspects of the site will use flash or any kind of animations to convey ideas to the website users. The site must come with a robust CMS. The site shall also be interactive and have an area for clients to log in and view information available only to clients. A project management system(ERP/CRM) component will be an advantage but not a requirement.