Awesome. The thing is, you'd have to buy a domain and stuff. Just keep it simple with a free software like that. Although, I won't be signing up, sorry. I can't stand that forum software >.< Is the server up now?
I attempted InvisionFree, but found out they had not updated it in a long time. Zetaboards is the "new" invisionfree. Good forums are as you said costly. Domains cost, servers cost, and even the forum provider charges you. If you would like another forum just tell me what would be the best engine to use. I used Zeta only because I had no idea who would use them or not, and that was the simplest to set up. Though I can set up any type of forum.
New update allows all the uses of persister to work on the normal Minecraft client, allowing even chests, furnaces, and tons of other things that didn't work too well, or at all to work now on the SMP. My persister is telling me it is outdated already, and cannot load up Minecraft anymore (this is after the update).