Really, if you are looking for a powerful CMS, Drupal is the way to go. Over the summer, IBM choose Drupal from all the open-source CMSs as the best suited CMS out there.
The
vbDrupal product, creates commen sessions and login between Drupal and vb, and includes tie-in such as forum blocks, profile links, calendar blocks and the ability to display drupal elements around the vb forum.
Also, the Drupal community is strong and going, with new modules coming in every week (over 300 total extra modules). Come support the
vbdrupal.org project, instead of starting from scratch.