Build an Organization Website Membership

We need a website developed on a CMS such as WordPress, Joomla!, DotNet Nuke, etc., that will be used as the hub for a professional organization to allow people to sign up and pay for memberships, communicate information to members, etc. Here is an example of a site we like: [login to view URL] however the site is slow loading and incorporates Flash, which I don't want to use, because we want the site to be both standards and platform compliant. Here are their specifications: Pages: Home Page About Us Mission Statement Board of Directors Useful Links Supporters/Sponsors Contact Us Join PREPA . Online Membership Application . Email Newsletter Member Search (this will go to Member Profiles) . Industry Search . Name Search . Location Search Education/Events . Education Calendar . Event Calendar In the News . News Article Section Photo Gallery Member Log In . Profile Upload . Photo Upload . Logo Upload . Member Message . Dues/Invoices For the Online Membership Application, Education Calendar, Event Calendar & Dues/Invoices sections they all need to have access to make a payment for both Member & Nonmember pricing. On our backend we need to hold the member contact information and have them listed as members so they get the correct billing on events & education. Nonmembers should be able to create a Nonmember profile. Member Profiles can have the following – Photo, Logo, Contact Information, Bio and link to their webpage. When they are in the Member Section we would like them to be able to send messages to another Member through the system. We will want the ability to upload images & video in the ‘In the News’ section. We would like to not show the email but have a contact page where they fill out their information and send blindly to the member. We would like to have some areas for advertising space. We would like to have less scrolling then the AAREA site and with a much cleaner and stylish look. The site would need to be easily administrated via the web browser, which is why we want it developed on something like WordPress or Joomla!