BuddyPress.org

@jeherve – there are some exciting developments happening with bbPress, which should help you build your site.

A new version of bbPress will work better with BuddyPress to provide the one main forum solution you are looking for, backed up by all the advantages of the BuddyPress social platform for looking after the user base.

A beta of the new bbPress (installed as a plugin in your WordPress site alongside BuddyPress) is due around the middle of September. @johnjamesjacoby is leading the development.

Not sure on the reviews / voting, but there are bound to be some good plugins out there.