I volunteer my vBulletin experience if needed. I administer 3 medium sized boards, as well as my own. I'll be able to help with mysql related issues as well as almost anything php related.
And while I don't create themes, I can install them and customize them if needed. vBulletin plugins are one of my strong points, and I have created several.
I've never done a php-bb to vBulletin conversion before, but I'm sure I'll be able to help out with it.
Let me know if I can be of any help