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CPU: AMD FX-6300 3.5GHz 6-Core Processor (£76.79 @ Aria PC)
Motherboard: Gigabyte GA-990FXA-UD3 ATX AM3+ Motherboard (£98.83 @ Amazon UK)
Memory: Patriot Viper 3 8GB (2 x 4GB) DDR3-1600 Memory (£49.98 @ CCL Computers)
Storage: Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive (£29.99 @ Amazon UK)
Video Card: Sapphire Radeon R7 265 2GB Video Card (£113.00 @ Ebuyer)
Case: Cooler Master K280 ATX Mid Tower Case (£31.55 @ CCL Computers)
Power Supply: Corsair CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply (£51.93 @ Amazon UK)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£11.79 @ Amazon UK)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£69.95 @ CCL Computers)
Keyboard: Logitech K120 Wired Standard Keyboard (£9.91 @ Amazon UK)
Mouse: Zalman ZM-M200 Wired Optical Mouse (£4.20 @ Ebuyer)
Total: £547.92
This rig is about as good as you can get for that price. If you have a little more money get a 1tb caviar blue WD drive, double the space for only a tiny bit extra.
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I feel like it would be helpful if a do a 'breakdown' of the build, so here goes...
FX-6300 is a decent CPU, especially for a low budget gaming PC.
The Motherboard has some nice features, and has on-board Ethernet.
8 gigs of DDR3-1600 ram. Pretty standard nowadays for most builds.
The HDD has 500g of space for games, movies, etc. If you have a little extra money, upgrade to a Caviar Blue 1TB HDD. It has twice the space for only a little more.
The R7 265 2g is a decent low-budget GPU, and you should be able to play most games medium-high settings.
The case works well and I personally like the way it looks.
The PSU is pretty popular, and if you wanted to Crossfire (AMD equivalent to SLI) it has you covered.
Optical drive works well. It can't do Blueray though. You would have to add a bit more for that.
Windows 7 Home Premium SP1. Its windows 7... Not much to say. If you wanted you could go to Windows 8.1 for only a little bit more.
The keyboard and mouse are cheap, but they should work just fine.
Well there you go. If I had a similar budget this is what I would do. If you want a Wireless adaptor try this-->http://uk.pcpartpicker.com/part/tp-link-wireless-network-card-tlwdn3800