£1k-ish budget

So, I built my current PC about 6 years ago (someone on here recommended this build, which I went with). Gigabyte ATi Radeon HD 7950 Windforce 3X 3072MB GDDR5 PCI-Express Graphics Card with FREE FARCRY3, Hitman Absolution, Sleeping Dogs & 20% off MOH Warfighter PC Games Intel Core i5-3570K...

Hi all, I have pretty much always built my own rigs but haven't upgraded/rebuilt for years so well out of touch with processors etc. Last time I was in a hurry and got whatever I could lay my hands on, so I currently have: Asus H87M-Plus Mobo Intel i5 4670K @ 3.4GHz 8Gb DDR3 Kingston HyperX...