For a cheap gaming build, I would suggest;
Fx-6300 cpu $129.99
sapphire radeon hd 7850 graphics card $154.99 (comes with 3 free games, Bioschock Infinite, Tomb Raider 2013, Far Cry 3 Blood Dragon)
970a-g46 motherboard $79.94
Kingston hyperx black ram, 8gb (2x4gb) $59.99 and are lower profile aluminum casing so you have space for big air coolers.
Then you could add any case/hdd/sdd/ cd dvd blu ray drive/power supply/cpu heatsink and still have it be cheaper than the link you posted.
Also, Windows 8 has a lot of compatibility issues with Anti-virus software and plenty of other useful programs. I'd stick with Windows 7 if I were you, unless you have a touchscreen monitor or something.