Upgrading graphics card. Help needed

Hi guys

Need to pick the brains of you guys. I'm fairly useless when it comes to hardware.

I'm looking to upgrade my graphics card and RAM just to get a little bit longer from my PC.

I have the Alienware Aurora R2 http://www.dell.com/us/dfh/p/alienware-aurora-r2/pd

What sort of graphics card would I be able to fit in this motherboard and what recommendations do you guys have?

https://docs.google.com/document/d/15t6LdmZRz3RYWqDWB8YOpCEsGIZvIxO0OMeYesupOmQ/edit?usp=sharing

link to the dxdiag in case that helps any of you with the info you need.

Thanks for the help guys