Best PC build

Solution
I can take that you have about £600 to spend on a system, but an FX-6300 with either GPU will lead to bottlenecks. Here's a counter-build -

PCPartPicker part list / Price breakdown by merchant

CPU: AMD FX-8320 3.5GHz 8-Core Processor (£104.16 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£23.82 @ CCL Computers)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard (£65.96 @ Scan.co.uk)
Memory: Crucial Ballistix Sport XT 8GB (2 x 4GB) DDR3-1600 Memory (£57.99 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£39.16 @ Aria PC)
Video Card: MSI Radeon R9 290 4GB TWIN...

dottorrent

Honorable
I can take that you have about £600 to spend on a system, but an FX-6300 with either GPU will lead to bottlenecks. Here's a counter-build -

PCPartPicker part list / Price breakdown by merchant

CPU: AMD FX-8320 3.5GHz 8-Core Processor (£104.16 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£23.82 @ CCL Computers)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard (£65.96 @ Scan.co.uk)
Memory: Crucial Ballistix Sport XT 8GB (2 x 4GB) DDR3-1600 Memory (£57.99 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£39.16 @ Aria PC)
Video Card: MSI Radeon R9 290 4GB TWIN FROZR Video Card (£215.15 @ Scan.co.uk)
Case: NZXT Source 210 (Black) ATX Mid Tower Case (£30.25 @ Scan.co.uk)
Power Supply: XFX 650W 80+ Bronze Certified Semi-Modular ATX Power Supply (£60.16 @ More Computers)
Total: £596.65
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-11-02 17:54 GMT+0000
 
Solution

+1; this build is possibly the best build you could get for 600 quids!