Whats the best gaming pc you could build for £600 including the os

Such a build including the OS would be this

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor (£130.94 @ Aria PC)
Motherboard: MSI H97 Guard-Pro ATX LGA1150 Motherboard (£51.13 @ Amazon UK)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory (£55.80 @ Kustom PCs)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£40.39 @ Aria PC)
Video Card: MSI Radeon R9 280 3GB TWIN FROZR Video Card (£149.99 @ Amazon UK)
Case: Corsair SPEC-01 RED ATX Mid Tower Case (£39.59 @ Aria PC)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£47.99 @ Aria PC)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£10.46 @ Aria PC)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) (£72.35 @ Aria PC)
Total: £598.64
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-01-30 12:50 GMT+0000

Good for 1080p@60fps in most games.
 
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