Server recommendation for my websites?

Hello, I have a forum website(invision board) and need some inputs to select a dedicated server. My forum has 8 million posts (Including posts and topics) in total.
Right now i am using Xeon 5260 2 bay chaisis, 12 gb ram, 400 gb SD. I just want to know how can we determine the server configuration based on what factors?
Do you know anything about Greenwebpage.com server hosting services? Any experiences? Where can I read reviews about them?
Thanks

 

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