PCPartPicker part list:
http://uk.pcpartpicker.com/p/P0z8
Price breakdown by merchant: http://uk.pcpartpicker.com/p/P0z8/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/P0z8/benchmarks/
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor (£167.99 @ Amazon UK)
CPU Cooler: Arctic Cooling Freezer 7 Pro Rev.2 45.0 CFM Fluid Dynamic Bearing CPU Cooler (£21.79 @ Amazon UK)
Motherboard: ASRock Z77 Pro4 ATX LGA1155 Motherboard (£89.99 @ Amazon UK)
Memory: Patriot Intel Extreme Master, Limited Ed 8GB (2 x 4GB) DDR3-1600 Memory (£36.23 @ Amazon UK)
Storage: Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive (£40.17 @ Amazon UK)
Video Card: HIS Radeon HD 7770 GHz Edition 1GB Video Card (£81.99 @ Ebuyer)
Case: Zalman Z9 Plus ATX Mid Tower Case (£44.34 @ Aria PC)
Total: £482.50
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-04-07 09:31 BST+0100)