Thanks for suggestions guys and I'm glad I started another AMD / Intel debate, it's been fun.
I can build a PC although it was a few years ago, but as I have a decent job, I Wouldn't mind getting Over Clockers to build it for me considering they do necessary stress tests and 24 months warranty.
I have been looking at AMD system more over Intel due to my previous experiences with AMD have been great.
Also the reason for the £700 price tag is that I plan on buying a whole new set up, monitor / gaming peripherals etc,
Cheers again ladies!
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