What about using Joomla for the whole thing?
I want to have interaction in the site area, so people can ask questions (but I don't want the comments or anything to be visible to the public), and I want a forum. Joomla can do that stuff easily, and integrate with a forum as well. I could also have a community, if people wanted to network in that way too.
What extensions would you recommend for a site like this?
I have a background with modding wordpress and vbulletin as desired, and can do anything I want with PHP, however I don't know anything about Joomla's capabilities yet. Every time I've tried to use it I have opted to use something else instead. This time I'm really going to use it and complete the site with it, but there are so many extensions that it's hard to choose which ones to use and which ones not to.
Thanks in advance!