Keep in mind though that this forum is heavily modified from the default configuration, and you'll want to use the latest version (currently 2.0.8 ) for security.
Good advice, I forgot to mention it.The new forum software that is currently in development is going to be open source so you could possibly wait and use that 
.
Yes, it's a good thing they will publish it as open source. That decision surprised me in a positive way..Not sure about how much the OP can wait though.
There are plenty of other for softwares though.
Xenforo seems to be well appreciated, too.