How do I build a CMS website like this

I'm a web designer and mainly built HTML & CSS websites, I know Wordpress as well but I don't think the site I want to build would work with

The site I would like to build is similar to this http://ift.tt/mk32tI I want people to review a product and write there opinions, Could anyone point me in the right direction? I know I will have to learn some new skills but really want to start building more advanced website.