hi, i wanted to build a gaming pc for a long time and i was wondering if this build is an okay choice or if i should change some parts my build; a 500gb seagate barracuda hdd a zalman z9 midi gaming case, an i5 3570k with a asus p8H61 mx mother board and 8gb or ddr3 ram at 1600mhz, and a sapphire hd 7850 2 gb gddr5 gfx card, and a 500w psu corsair builder series ,and a 1080 p monitor , which all adds up to 636 pounds roughly or 960 us dollars this is kind of stretching my budget but is there any parts worth getting or upgrading or even downgrading , thanks