Damn. I saw the title and got a little glimmer of excitement as this is what I consult on day in and day out.
Unfortuantely, although I use Joomla for my website, I can't really advise on any other open source software.
Now, if your companies decide they want to spend lots of lovely cash on some Enterprise CMS then Im your man*
*note: I dont get out of bed for less than 3 million 