I am going to buy a sapphire radeon HD 6870 graphics card , i7 skylake 6700k cpu and a cryorig h7 49.0 cfm cpu cooler, WD 2 TB 3.5-inch Internal Hard Drive - Black, Samsung 2.5 inch 1 TB 850 Evo Solid State Drive and a ASUS H170 PRO GAMING Intel LGA1151 ATX Motherboard USB 3.0, SATA 3, HDMI and DVI this will all go into the high performance gaming pc atx case screwless front usb 3.0 and sound but I don't know what power supply I need thanks - Awesome_2