[OSCOM] CMS Choices

I am in the process of deciding on a CMS product for my needs and I need 
a little guidance since I have never had a need for CMS before. I can be 
pretty flexible as far as technology (java/php/etc;) but I have some 
pretty specific needs with regards to function. I would prefer some form 
of open source, something that runs on linux, based on open standards 
(to the extent they exist) and that has the ability for plug 
ins/addons/extensible. Basically, the setup I am looking to implement is 
multiple sites by multiple companies so I would like to not have to 
setup multiple installations but share one installation but I will use 
multiple installations if I need to. The sites have a mix of static data 
and dynamic data presented based on queried/posted info from user input. 
Some sites will require events calenders, search capability, newsletters 
and address book management (site address book users, not CMS users). I 
am a programmer so I can write/modify plugins to do what I need to do 
when it does not exist (ie; that address book thing). The site owners do 
not (mostly) really need to create new pages (I am doing it so I can 
code without wysiwyg), although one site will need to create new 
newsletters from templates (or dynamically based on data...), but they 
will need to create and edit events, and other content. That is actually 
why I need the CMS portion, just to handle the data entry. I was 
thinking of writing all of this myself since an editor is not really 
needed, just data entry but I would hate to reinvent the wheel and would 
prefer to leverage what is out there.
The front end site cannot look like a CMS based site so things such as 
blog/slash-like packages are out. What I am currently looking at is 
Mambo, Midgard/Aegir, Cocoon/Lenya, ezPublish, and openCMS. What is 
everyone's opinion of those choices and am I missing something here that 
I should be looking at? Is CMS overkill and I should roll my own? I am 
curious about search. I do not see much out there so any advice on that 
part would be good. In a pinch we can use google's API so that is not 
required.
Thanks in advance,
Tom

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