This is what i came up with.
PCPartPicker part list:
http://uk.pcpartpicker.com/p/fPh9Hx
Price breakdown by merchant: http://uk.pcpartpicker.com/p/fPh9Hx/by_merchant/
CPU: AMD FX-6300 3.5GHz 6-Core Processor (£79.99 @ Amazon UK)
Motherboard: Asus M5A78L-M/USB3 Micro ATX AM3+ Motherboard (£45.89 @ Amazon UK)
Memory: Kingston HyperX Fury White 8GB (2 x 4GB) DDR3-1600 Memory (£38.39 @ Amazon UK)
Video Card: MSI Radeon R9 380 4GB Video Card (£184.99 @ Amazon UK)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£47.02 @ Amazon UK)
Total: £396.28
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-07-22 11:13 BST+0100