CMS - portal server Question

[Achilleas mantzios]

Hi,
i am thinking of deploying a CMS system for our corporate web server.

I have seen/installed/tested :

Jboss Portal : Seeems good and standards complying but too unstable
Apache Lenya : Very unstable - could not get it to any useful work
Php-nuke     : (despite our favor towards java, this seems stable but not what we want)
OpenCMS      : Very stable but not so open source - some one has to pay to get anything more than the basic

Practically from just browsing and using google one could conclude that there are 10ths of 
open source tools that do content management.
Also it is impractical to install even 10% of them.
Moreover web articles/reviews/comparisons rarely give anything but biased views.

So since i think that our type of need falls in the same big family as the ones
working in the java unix world i would like to ask you about your experience
in this field.

Thanx

Achilleas Mantzios.