PCPartPicker part list:
http://uk.pcpartpicker.com/p/gKcQGX
Price breakdown by merchant: http://uk.pcpartpicker.com/p/gKcQGX/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/gKcQGX/benchmarks/
CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor (£140.39 @ Aria PC)
Motherboard: MSI H97M-G43 Micro ATX LGA1150 Motherboard (£65.96 @ Scan.co.uk)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£55.34 @ Scan.co.uk)
Storage: Kingston SSDNow V300 Series 60GB 2.5" Solid State Drive (£34.98 @ Dabs)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£39.50 @ Amazon UK)
Video Card: MSI Radeon R9 280X 3GB TWIN FROZR Video Card (£204.34 @ Scan.co.uk)
Case: Thermaltake Versa H22 ATX Mid Tower Case (£26.24 @ Scan.co.uk)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£46.98 @ Aria PC)
Total: £613.73