I believe that the hacking problems have all been resolved with the newest releases of the phpBB forum software. The script is still free and although I haven't used it myself for a while, the new
website hosting looks excellent. I have been told that it is much improved since the last versions, but have yet to try it myself.
I urge you, however, to search through the
website hosting I posted above and try to find a script that suits your needs and appeals to you.