I presume phpBB won't do it for you? (It can be quite heavy but it is feature rich, tons of support and more mods than you could throw a rain forest full of sticks at).

Or I had a look around and some people are comparing http://www.mybboard.net/ to a similar but free version of vBulletin, have not tried it myself though.

MyBB from what I could see has in-built portal and some mods floating around to do some things with it, as for the wiki I didn't see anything extensive in terms of mods and unsure if in-built is any good to you.

Anyway if I come across anything really good, I'll be sure to let you know.


EDIT: Also drupal looks pretty nice!!!