Aidan - The Lounge is typically used for more casual conversations. Questions are better asked in the Using Moodle forums. Your question sounds like a Hardware/Performance question so you could try the
Hardware and Performance forum. You may wish to start at
Installing_Moodle#Hardware. As for cost, it depends if you are buying a server and starting from scratch or hosting with someone like a Moodle Partner. There are many variable to factor in to the equation so I would encourage you to share more specifics about your situation and ask folks to comment or make recommendations. The type of server needed depends on what types of
activities are being done, how many users are expected to be connected concurrently, etc. Best of luck with your thesis. Peace - Anthony