Building a computer isn't an option as my mother won't let me and to be fair I can see why, so building one isn't an option at all, I'm stuck between this Dell CPS gaming PC and the Alienware Aurora R6 PC, here are both systems
http://www.pcworld.co.uk/gbuk/computing/desktop-pcs/desktop-pcs/dell-xps-tower-gaming-pc-10157858-pdt.html
http://www.pcworld.co.uk/gbuk/computing/desktop-pcs/desktop-pcs/alienware-aurora-r6-gaming-pc-10158106-pdt.html
http://www.pcworld.co.uk/gbuk/computing/desktop-pcs/desktop-pcs/dell-xps-tower-gaming-pc-10157858-pdt.html
http://www.pcworld.co.uk/gbuk/computing/desktop-pcs/desktop-pcs/alienware-aurora-r6-gaming-pc-10158106-pdt.html