No point in getting an apu when you are using a dedicated gpu. This will run it on high/ultra settings. This has everything you need (apart from os)
PCPartPicker part list:
http://uk.pcpartpicker.com/p/2H0TP
Price breakdown by merchant: http://uk.pcpartpicker.com/p/2H0TP/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/2H0TP/benchmarks/
CPU: AMD FX-6300 3.5GHz 6-Core Processor (£80.00 @ Ebuyer)
Motherboard: Gigabyte GA-990FXA-UD3 ATX AM3+ Motherboard (£98.98 @ Amazon UK)
Memory: Patriot Viper 3 8GB (2 x 4GB) DDR3-1600 Memory (£59.99 @ Amazon UK)
Storage: Western Digital WD Blue 250GB 2.5" 5400RPM Internal Hard Drive (£33.51 @ Ebuyer)
Video Card: Zotac GeForce GTX 760 2GB Video Card (£174.98 @ Dabs)
Case: NZXT Source 210 Elite (Black) ATX Mid Tower Case (£38.65 @ Scan.co.uk)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£44.96 @ CCL Computers)
Total: £531.07
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-01-25 00:34 GMT+0000)