Thanks for the for help.
I think my #2 question might have been misleading.
I'm gonna dump phpNuke and bb2 and go with vbPortal and vBulletin. I was curious on a converter to move all the bb2 stuff over to vbulletin. The reason I mentioned phpnuke is that I install bb2 as a port on it. So some of the tables differ from a standard bb2 install. They have been changed to work together with phpnuke.
Either way I'm not too concerned with it as I just started the site 2 weeks ago so the database is still real small. I might just start from scratch. Hell half the threads and posts were about the site anyways, which won't exist anymore when I make the changes. I'll simply find a way to transfer over the usernames only.
Time to head over to vbulletin.com and make a purchase.