is there a script that does this

[smashfactory]

- i am lookng for something that-
has a main template that if i change info on the main page, it will change it on all the subpages
- it needs to have an account sign up- then the account holder will get a "page" of their own to list certain things-
- the page itself needs to be set up in a way where they fill out a form for the info, and it shows up nice and neat on the webpage.
- the account holder can edit the page at any time
accounts can be automatically timed- to say expire in 6 months

i know this sounds kinda like a classifieds- but i need a main page, with a directory type set up- then in the directory, is the individual account holders pages, in which they can update.
kinda like with a classified, on the account holders page will have information that would stay there- like name, website, email, etc... then the body of the page within the template would have where they would list their things- but the items they list can be extensive- there needs to be a template of some sort for the body, so it always shows like:

Item Age Price Blah Blah

and eveything they fill out, will fill in under the headings

and- how much does it cost for someone to install and modify?
thanks!

[nubhost]

im not sure if there are anything out there like this,(probably because i haven't heard of it), but im sure its doable.