PCPartPicker part list:
http://uk.pcpartpicker.com/p/3vimy
Price breakdown by merchant: http://uk.pcpartpicker.com/p/3vimy/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/3vimy/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor (£164.39 @ Aria PC)
CPU Cooler: Cooler Master Hyper TX3 Evo 43.1 CFM CPU Cooler (£16.00 @ Amazon UK)
Motherboard: MSI Z87-G43 ATX LGA1150 Motherboard (£72.70 @ Amazon UK)
Memory: G.Skill Ripjaws Z Series 8GB (2 x 4GB) DDR3-2400 Memory (£73.85 @ CCL Computers)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£40.09 @ Aria PC)
Video Card: PowerColor Radeon R9 290 4GB Video Card (£295.19 @ Aria PC)
Case: Antec Three Hundred Two ATX Mid Tower Case (£54.99 @ Amazon UK)
Power Supply: SeaSonic 760W 80+ Platinum Certified Fully-Modular ATX Power Supply (£136.51 @ Scan.co.uk)
Operating System: Microsoft Windows 8 (OEM) (64-bit) (£73.74 @ Ebuyer)
Monitor: Asus VS238H-P 23.0" Monitor (£136.70 @ Amazon UK)
Case Fan: Enermax UCMAA12A 83.0 CFM 120mm Fan (£8.38 @ Scan.co.uk)
Case Fan: Enermax UCMAA12A 83.0 CFM 120mm Fan (£8.38 @ Scan.co.uk)
Case Fan: Enermax UCMAA12A 83.0 CFM 120mm Fan (£8.38 @ Scan.co.uk)
Case Fan: Enermax UCMAA12A 83.0 CFM 120mm Fan (£8.38 @ Scan.co.uk)
Keyboard: A4Tech G800V Wired Gaming Keyboard (£18.00 @ CCL Computers)
Mouse: Cooler Master CM Storm Inferno Wired Laser Mouse (£31.14 @ Scan.co.uk)
Headphones: Logitech G930 7.1 Channel Headset (£101.99 @ Amazon UK)
Total: £1248.81
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-20 22:13 BST+0100)