vbulletin! if it works for boards, it’ll work for us! And it has a lot of extra functionality. It’s paid for, but it’s worth it! We evaluated a load of forum software for Age of Wulin, and it came up trumps. There are also tons of extensions you can get for it.
Should be able to import PHPBB (this forum) according to http://www.v7n.com/forums/forum-management/217933-phpbb3-database-move-vbulletin.html
As for the CMS, probably wordpress would be the best bet, it’s very easy to use and very easy to set up.
my 2c :)