im running 17 2600k, dh67cl mobo, 16gb ram, nvidea gtx 660 gfx card, 1 ssd 2 HDD a multi slot card reader and a cd/writer, 4 fans on a 550 watt coolermaster psu.
anything around 500watts should be fine, but if your using multiple pci slots for different compaents i suggest anything between...