Ι Know i am a little of your budget but this is my build for you.
If you really cant spend 50+ i will try to edit some stuffs.
PCPartPicker part list:
http://uk.pcpartpicker.com/p/1zUt5
Price breakdown by merchant: http://uk.pcpartpicker.com/p/1zUt5/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/1zUt5/benchmarks/
CPU: AMD FX-6350 3.9GHz 6-Core Processor (£99.59 @ Aria PC)
Motherboard: ASRock 970 Extreme3 ATX AM3+ Motherboard (£67.15 @ Amazon UK)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1866 Memory (£65.00 @ Ebuyer)
Storage: Western Digital Caviar Black 500GB 3.5" 7200RPM Internal Hard Drive (£53.94 @ Amazon UK)
Video Card: MSI GeForce GTX 760 2GB Video Card (£209.99 @ Aria PC)
Case: Zalman Z11 Plus ATX Mid Tower Case (£49.33 @ Scan.co.uk)
Power Supply: OCZ ZT 650W 80 PLUS Bronze Certified ATX12V Power Supply (£69.95 @ Scan.co.uk)
Optical Drive: LG GH24NS95 DVD/CD Writer (£14.99 @ Amazon UK)
Monitor: LG E2442V-BN 24.0" Monitor (£119.00 @ Ebuyer)
Total: £748.94
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-04 17:29 BST+0100)