What are you using for Content? Mod or CMS?

[3z3k3l]

I have been using Postnuke for content for many years then got VBulletin and migrated everything over to it, my SEO has taken a big dive since then, I am using vbnews and VBArticles and VBSEO, I find that my site has gone down about 10 places on Google and Yahoo for "PBX".
I am contemplating going back to postnuke or using Joomla, but was wondering what you guys are using and what success rate your having with content and search engine placement.
Also what article system is easiest to manage and does news and content in one?

Thanks for your suggesitons/feedback.