Advanced Low Cost Editing Software I am looking for a cheap (not necessarily free) editing software.
At the moment I have to work with Serif MoviePlus X6 but I find this too basic.
I have a lot of knowledge of video editing but am usually restricted by the limitations of the software I can afford. I need something as advanced as After Effects - and similar to Blender's layout which is NOT designed for ease of use but rather to offer as much flexibility as possible - for general video editing; but for a lower cost than Adobe products.
Any suggestions?

ANSWER
Of the amazing answers I received I found the best suggestions were:

BlackMagic Davinci Resolve 12
Lightworks
Hitfilm has a free express version and a paid version. 
It's a video editor and a compositor.