Basically I am unsure how much power I will need for my system. I plan to run with one 4850 X2 video card, 6 sticks of 2GB DDR3, an i7 920, 2 SATA hard drives, 1 DVD RW drive, and maybe a Blu-Ray reader and SS drive. I want to make sure I have plenty of headroom for overclocking. I did a power...