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PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor (£77.99 @ Aria PC)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard (£61.99 @ Amazon UK)
Memory: Kingston Blu 8GB (2 x 4GB) DDR3-1600 Memory (£59.82 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£35.99 @ Aria PC)
Video Card: Gigabyte Radeon R9 270X 2GB Video Card (£147.92 @ Scan.co.uk)
Case: Cooler Master K380 ATX Mid Tower Case (£37.62 @ CCL Computers)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£44.98 @ Amazon UK)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£11.79 @ Amazon UK)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£69.96 @ CCL Computers)
Total: £548.06
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-17 07:25 GMT+0000)
 

+1 To this build. I wouldn't change a thing, except I would get a Western Digital Caviar blue 1TB.
 

Make that +2! Seagate has had some errors in the past but I'm pretty sure those HDDs come with warranty so you're fine.