I still say a PhP board system with moderators and admins is the way to go. The database is kinda small and it is ultra simple to use. Then there can be as many boards and topics as fencer wanted. most of all it's free.
(hide) If you want to save on bandwidth you can reduce the amount of information that shows up in your pages in the Settings. Try changing the number of games in the main page and the number of messages per page. (pauloaguia) (show all tips)