Drop phpNuke, and use vBulletin standalone. Add a good solid theme and an add-on to give you that front-page portal look you have with nuke. No need to use 2 products to achieve the same thing you can do with vbulletin alone almost. It'll be more secure.
vBHome example
http://www.xboxnextgen.com/index.php
myVBindex examples
http://ricoche.net/forums/vbindex.php
http://www.digitalkore.net/
Add WebmasterLabor.com if necessary to add new articles or solicit them from members.
http://www.webmasterlabor.com
Add a gallery like Photopost which integrates with vBulletin.
http://www.photopost.com