Hi, we are organizing a convention for roughly 2000. Last year we
used a giant excel spreadsheet, and of course this was a disaster. We
need a way for people to pay online (paypal) and have it linked to an
account where they can also change their badge name, other info, get
updates, etc. Also I will tie it into the forum system.

So, I'm thinking it's time for a CMS to handle all the info. That way
people can controll how they're updated (email or not), name, display
name, etc. I was going to build some giant custom thing to handle all
the info but then I remembered. Hey the website sucks and people
should be able to change their stuff.

So my question: What is a good CMS to securely handle semi private
data and can hold 2000 entries without dying?