PCPartPicker part list:
http://uk.pcpartpicker.com/p/MnPjbv
Price breakdown by merchant: http://uk.pcpartpicker.com/p/MnPjbv/by_merchant/
CPU: Intel Pentium G3258 3.2GHz Dual-Core Processor (£47.98 @ Amazon UK)
Motherboard: MSI Z97-G55 SLI ATX LGA1150 Motherboard (£84.99 @ Amazon UK)
Memory: Corsair Vengeance Pro 8GB (2 x 4GB) DDR3-1600 Memory (£67.14 @ More Computers)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£39.59 @ Amazon UK)
Video Card: Sapphire Radeon R9 270X 2GB Dual-X Video Card (£119.00 @ Amazon UK)
Case: NZXT Source 210 (White) ATX Mid Tower Case (£31.45 @ Scan.co.uk)
Power Supply: Corsair CSM 650W 80+ Gold Certified Semi-Modular ATX Power Supply (£66.99 @ Amazon UK)
Optical Drive: LG UH12NS30 Blu-Ray Reader, DVD/CD Writer (£38.38 @ Ebuyer)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) (£72.35 @ Aria PC)
Total: £567.87
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-11-23 12:27 GMT+0000
is over your budget i guess ...but futur proof with sli support if you go with nvidia gpu