content management system

[Zeroimage]

Hi all,
I hope this is in the right section.
I'm looking for a new content management system. I currently use PHPNuke but I'm finding it too restrictive for my site as well as too comman. I looked at Miraserver and it seems perfect but at $159 its way too expensive for me so here I am looking for something just like Miraserver but free(unless some kind person would donate it to me ).

I'm not very good at web design or any web languages and so a content management system is ideal for me, I hope someone can point me in the right direction.
What I'd like is something that supports a sectionb were people can register and I can make some parts of the site for these registered members only. I would like to keep some of the php files I use so php support is important (plus I've just started to learn php in my spare time).

Well I hope you understand what I'm looking for and can point me in the right direction.

Thanks inadvance....