phpBB has alot of security flaws, although I did ask one of the Bodhost.com people about it, and he said they have made a few changes to it.
But I suggest, if your paying
vB (
www.vbulletin.com) one of the best forums out there, only it costs :( but has alot of features.
You could also use, Invision powerboard (
www.invisionfree.com), or SMF, there is just so much that are decent.
But go with
vB ! Its the best ^.^