PCPartPicker part list:
http://uk.pcpartpicker.com/p/18nEP
Price breakdown by merchant: http://uk.pcpartpicker.com/p/18nEP/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/18nEP/benchmarks/
CPU: AMD FX-8350 4.0GHz 8-Core Processor (£143.99 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£24.49 @ CCL Computers)
Motherboard: Asus Crosshair V Formula-Z ATX AM3+ Motherboard (£167.98 @ Dabs)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£41.77 @ Amazon UK)
Storage: Corsair Force Series GT 120GB 2.5" Solid State Disk (£108.23 @ CCL Computers)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£44.99 @ Aria PC)
Video Card: Club 3D Radeon HD 7870 XT 2GB Video Card (£210.39 @ Amazon UK)
Case: Zalman Z9 ATX Mid Tower Case (£32.10 @ Amazon UK)
Power Supply: Fractal Design Tesla R2 500W 80 PLUS Gold Certified ATX12V Power Supply (£60.97 @ Amazon UK)
Optical Drive: LG GH24NS95 DVD/CD Writer (£14.99 @ Amazon UK)
Operating System: Microsoft Windows 7 Professional SP1 (OEM) (64-bit) (£101.99 @ Aria PC)
Total: £951.89
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-06-20 14:24 BST+0100)
pcpartpicker uk didn't have the gen3 Sabertooth, so I stuck the Crosshair V Formula-Z in there knowing your board will likely be a bit cheaper. So everything comes in under 950 GBP depending on what you can find the 990FX Sabertooth Gen3 for. I also have a SSD in there as well, be sure to install windows and your games onto that for significantly faster load times