Have you tried browsing or even posting in the Server Configuration forum at vbulletin.com?
http://www.vbulletin.com/forum/forum...-Configuration
I would post there and await a reply, Eva2000 aka George knows his stuff hands down!
Edit: Found your post over there, anyone else searching for a similar answer please view the replies here:
http://www.vbulletin.com/forum/showt...d-new-server.?