What CMS should I use for my site? (site explanation included)

I'm sorry, but the answer to the problem is not that easy at all and doesn't require

... I don't know what i need to be able to do to be considered a coder cause I know HTML, CSS, JS, and C, but I do not consider myself a php pro. so yea... I do consider myself a coder and I did code the site's current template by myself.

 

with just PHP + mySQL + CSS + JS (even better using Jquery and Mootools!)
you can make or clone ANY possible site.

once you know how it all works you'll be surprised by how easy it
is to make this or that function.

think about content, usernames, whatever else, all you need is
make a few SQL queries and change the data according to your
needs.

yes, it's that easy, and yet people pay big bucks $$ to have
a few more icons and buttons...

 

Hybrid theme for WordPress uses thumbnails as permalinks and it generates them from any image you upload.

bbPress is a forum solution for WordPress. There are a few of them also.

Frontpage login is easy with the MiniMeta Widget plugin.

 

Somehow AJAX was forgotten ;-) If you will use blog style template, DLE will do the job.
RSS built-in already. Categories - you can have n of it, categories can have parent ones.
Forums: both simple & complex level integrations modules with IPB, vBulletin, phpBB, SMF.
Login: can be implemented at any page position. 99% of templates has it already. So so..

 

yup,wordpress is the best