SocialEngine, and it not only give us the ability to run a forum, but also create our own social network of sorts. It does come with a hefty price tag. For the features we want to include it'll cost between $500-$600. We'll be able to offer IM, Chat, Forums, Photo Albums, Groups, Polls, and Blogs. Pretty robust.
So we really want to get a lot of people testing it out so we can help their opinions, because after all we want to have something people will use and enjoy themselves there. We also want to make sure it is worth our investment.
So if you want to check it out, head to our SocialEngine trial here: http://setrial.themarriedgamers.net. Be sure to 'Friend' me!