Also why did you chose to get the 580's over the 680's, 7970's or even 670's. All three of them would be better choices. Secondly, get a smaller power supply, something like a 850w would be plenty, that would leave you with enough money for an SSD 120GB SSD's can be had for less than £80 and i highly recommend getting one to install the OS on and any frequently used programs. I have all my games on my SSD and the loading times are brilliant, i would have had Widows 7 installed on it if i could be bothered to go through the trouble of re-installing it on my computer.