Much of a muchness really..
I'd go for a Radeon R9 280, MSI TwinFrozr or Gigabyte Windforce have the extra warranty and quieter coolers. Here's a cheaper one:
http://www.amazon.co.uk/SAPPHIRE-AMD-Graphics-Card-DDR5/dp/B00IRTXPBM
4GB RAM? Are you Trig? Go for 8GB, should be available for a smidge under £60 - say something like this, feel free to find cheaper sources:
http://www.amazon.co.uk/HyperX-Series-1866MHz-Memory-Module/dp/B00J8E91T0
CPU - the i5-4690k would be a sweet spot, if you want to spend less then the i5-4460 is also pretty good.
Motherboard - muh... say the Gigabyte Z97P-D3?
So:
http://uk.pcpartpicker.com/p/F7K3vK
Yes it's a bit more, but it should be quite a bit better overall. An SSD would be a good idea, and a different CPU cooler if you want to overclock.
EDITED: 5 Feb 2015 18:34 by NUKKLEAR