Thinking about replacing forum

I've been thinking lately about either dropping, moving, or changing our forum. I've been using Ning over a West OK Journal for their forum/social network, and I really like it. Not only is it a forum, but you can share pictures, video, and audio easily. Using Ning will increase social interaction between members, and greatly improve spam prevention. That last reason is one that got me thinking about changing. I have to remove spam from the forum at least twice a week. Yes that's not a lot, but its still a hassle when you are trying to build something useful.

What do you think?