So thanks to the help of everyone on the forum i have decided on a intel i5 4570 haswell (im not planning on overclocking)
A GeForce gtx 760 acx 2gb
(I was going for the gigabyte but the price took a £20 increase so the geforce was only £8 more)
And 12-16gb of ram
Before I make the purchase how can i check what kind of performance i will be getting?