Which PC should i buy for gaming?

Which PC should i buy for gaming?
Added (1). http://www.currys.co.uk/gbuk/computing/desktop-pcs/gaming-pcs/pc-specialist-vortex-odyssey-gaming-pc-10004701-pdt.html#cat-0

http://www.currys.co.uk/gbuk/computing/desktop-pcs/gaming-pcs/lenovo-erazer-x310-gaming-pc-10108863-pdt.html#cat-0
Added (2). I intend to use the computer to play games such as DayZ Standalone, Arma 3, CSGO and CoDs
Added (3). I would also like to be able to run these games on high to ultra on at least 40 fps:)

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