[deanhills]

For CMS System, I will recommend MyBB is best for all Purpose!
Good and best work.

myBB is probably the most popular Forum software, but I don't find it necessarily the best and easiest to use.  I don't find it's themes easy to work with including trying to modify the templates.  phpBB is a great example of a good way for installing styles and extensions.  I haven't installed anything at phpBB yet that has broken a style or didn't work with a style as the Admin at the phpBB Community Forum are quite strict with testing their styles first to high quality standards, before styles are posted on the phpBB Board.  As far as I can see myBB is quite relaxed with themes being posted at myBB Community Forum and you may hit bad luck with themes that aren't always compatible with all of the plugins as the plugins are designed to work with the myBB default theme only.