Web Site Move

Looking to move a forum for my ECE friends from deepmist.net to the new web space…  Then I found out that Invision Power Board is not free anymore.  So I’ll need to find a free board software again.  Currently looking at phpBB (what else) and Discuz!  Discuz! is developed by a mainland China software company, and the functionality looks pretty good (compared to phpBB 2.0.1).  But I’ll see how I can mod phpBB before deciding.