Right now I am using an Antec 350W Smartpower PSU with the voltage/amp rating as below,
(+5/ 35A, +12/21A, +3.3/28A, -5/0.5A, -12/0.8A, +5 SB/2A).
If I total them down to wattage it comes down to more than 450 watts. I will be running 2 hdd, 2DVD-RW, 2 sticks of RAM, 3 PCI card and one 6600GT...