Apparently we have some common interests
Actually i'm using joomla to create two websites of research departments in the university where i work.
To my mind joomla is definitively the way to go. If you feel more adventurous you could also try ruby on rails wich is also very interesting but lacking of a working cms now.
I'm afraid that we are a bit off topic now, oups.
By the way it would be nice to have ispconfig support lighttpd.