I know it's over budget but you can't get a gaming pc for £300 really:
PCPartPicker part list:
http://uk.pcpartpicker.com/p/3omMP
Price breakdown by merchant: http://uk.pcpartpicker.com/p/3omMP/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/3omMP/benchmarks/
CPU: AMD Athlon X4 760K 3.8GHz Quad-Core Processor (£58.05 @ Ebuyer)
Motherboard: ASRock FM2A88M-HD+ Micro ATX FM2+ Motherboard (£39.48 @ Amazon UK)
Memory: Patriot Signature 4GB (1 x 4GB) DDR3-1333 Memory (£25.88 @ CCL Computers)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£35.94 @ Aria PC)
Video Card: Gigabyte GeForce GTX 650 1GB Video Card (£72.99 @ Amazon UK)
Case: BitFenix Merc Alpha (Black) ATX Mid Tower Case (£27.95 @ Amazon UK)
Power Supply: XFX 450W 80+ Bronze Certified ATX Power Supply (£20.00 @ Maplin Electronics)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£11.69 @ CCL Computers)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£69.96 @ CCL Computers)
Total: £361.94
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-08 21:23 BST+0100)
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