[Skunkworks] WebHost Solutions [Personal Experiences]

Hi Guys, Anyone who has had experience with any of the following Web-Host companies? 1. Just-Host 2. NTC Hosting 3. HostClear 4. BlueHost 5. Amazon Cloud Service More specifically am interested in the following aspects of Webhosting - We are doing an e-learning solution on Moodle and also a Web-Portal so the host has to be scalable in terms of Database Size, Traffic etc - Am also interested to know about support service experiences [24/7, Ticketing, Email, Chat] Any other Webhost company anyone would recommend?? Thanks, James W