As a reference point you should check out PC World --
http://www.pcworld.co.uk They're not the cheapest so you can use them as a high watermark.
Searching the site for "Gaming PC" below £600 (assuming you might be tempted to stump up another 10% for the right machine) gave me 6 hits, inc:
CYBERPOWER Empire Elite Gaming PC £499.99
22 reviews
AMD FX-4300 processor
Windows 8
Hard drive: 1 TB
Memory: 8 GB
Graphics: AMD Radeon™ R7 250 |
ASUS M51BC Gaming PC £569.99
7 reviews
Claim a free game when you purchase this product.
Offer ends 30/06/2015. Ts&Cs apply.
Windows 8.1
AMD FX-8300 processor
Memory: 12 GB
Graphics: AMD Radeon R9 255
Hard drive: 2 TB |
PC SPECIALIST Infinity Trion-X Gaming PC £499.99
Windows 8.1
AMD A10-7700K APU
Memory: 8 GB
Graphics: Integrated AMD R7 (space for your choice of dedicated card)
Hard drive: 1 TB |
I'm not up to speed with the current range of CPUs and graphics cards; the last time I did my research for a new PC was a few years ago, so I have no idea how suitable these PCs actually are for hard-core gaming.
When I bought my last PC I worked out what CPUs and graphics cards were suitable and then googled for them (along with other criteria such as disk size) to find PC models which matched my required spec.
http://www.pcgamer.com/the-best-pc-gaming-cpus-processors/
The best budget gaming processor
Intel Pentium K Anniversary Edition G3258
http://www.pcgamer.com/the-best-graphics-cards/
The best budget graphics card
AMD Radeon R9 270X
(The articles also mention other possible alternatives.)
One particular brand I have heard good things about is Alienware (their machines definitely looked cool when I visited their shop in London.) The
Alienware X51 desktop starts off at £599.
http://www.alienware.co.uk/Landings/desktops.aspx
Andy
For reference:
7 best gaming PCs 2015: What's the best gaming PC you can buy in the UK?
http://www.pcadvisor.co.uk/test-centre/desktop-pc/best-gaming-pcs-in-uk-2015-uk-may-3338847/