Post Page Dilemma – WordPress as CMS

Hi all,

I am making somewhat a mid-scale website with lots of content and each of the link have lots of sub-pages.

As, every CMS, some pages need to be shown as boxes as a featured content.

Now, I just need just two functionalities. I want to categorize each page fully so that I control it and i want to allow the user to dynamically change the order of the Pages within any parent link.

Help me in this. Should I use Pages or Posts? If you can help me in terms of any plugin, I would be very thankful.

Many Thanks!