vbindex is more or less a portal.. a CMS is quite a bit more detailed in nature and a ton more thorough in the way it presents and handles content/ media.. not that anything is wrong with vBindex.. in fact, i use it.. but lately have been considering Mambo.. but i have even gone past that to typo3..
http://www.typo3.org
now that is a CMS.. but something not easily accomplished in a 5 minutes install script..