[Zope] Website For Computer User Group (CUG)

[Tom Purl]

I am the new volunteer webmaster for a small computer user group (CUG), 
and I've been charged with doing a major redesign.  I would like to use 
some Zope-related product like CMF or Plone, but I don't know which one 
is best for me.

I basically want a site where users can do the following:

  - download (and maybe upload) CUG presentations and other documents
  - Discuss tech news
  - Ask other members about technical problems that they're having.

Also, I would like all of the users to register, but I would like to 
make that process as easy as possible.

Having said all that, what's the best option?  Squishdot looks nice, but 
does anyone have experience doing something similar with Plone or CMF?

I'm assuming that this type of question gets asked fairly regularly, but 
I looked online for a couple of hours and couldn't find an answer.  Any 
help at all would be greatly appreciated.

Thanks!

Tom Purl