We are a small nonprofit consulting group looking to find and use an
intranet service through which we can easily collaborate on projects,
share information, post files, have discussions, conduct surveys, etc.
on an easy-to-access website that would be accessible on any standard
internet connection and internet browser. (Something like Microsoft
Sharepoint) I would like a list of best intranet services out there
given the following capabilities and constraints:
- Since we're very budget-constrained, we'd like it to cost less than
$700/ a year or about $60/month with about 10-25 users.
- Since we have a lot of files to store, we'd want atleast  4-5 GB of
space to save documents and other files
- To facilitate communication and idea development, we'd like it to
have a discussion forum/wiki page where we can post thoughts easily
- For organization's sake, we'd like it to have some sort of
folder/filing system that we can save our shared documents in.
- If possible, a way to track versions of the same file. (not required)
- Also, not required but preferable, a tool to easily conduct surveys
amongst users of the intranet.
- And if possible, we'd like it to have a calendar feature, though
this is not as important as the requirements listed above.

Some services that I've already found but that don't quite fit the bill are: 
hyperoffice.com, 1and1.com and Groove. Hyperoffice had an outstanding
platform-- it did everything I wanted (even versioning!)... however it
costs about $150-$200 a month given that we will have about 25 users.
1and1.com had a more reasonable cost... ($20/month) however
unfortunately the service only lets me store about 500 MB of files on
their server, too little for our requirements. Groove had all the
capabilities I listed above but it requires separate software
installation since it doens't work within a browser and it cost about
$20/person/user... too much.

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Request for Question Clarification by hedgie-ga on 29 Aug 2005 01:44 PDT

I see this as two questions

1) which ISPs offer inexpensive storage

2) which Open CMS should we pick

 (you should not be charged per user or per hour)

for 2) spend some time here 

http://www.opensourcecms.com/

(you may have to have to aquire some expertise
      yourself or get a 3rd item (a local) consultant.

 But try the demos first. 

Many ISPs offer automatic (one click) installation of these systems

 So select CMS first, then select ISP who offers that,
 using links  from the  CMS sites.

 Feel free to expire the question ( Then it is a free contribution) 
 If you have more questions and would you want me to proceed, to answer,
I would like to know a bit more about your activities and current state of IT
 you and your members use ..