I am building a system on the same K8WE board. BE CAREFUL, choose a PSU that has four 12v rails. I first bought a PSU advertised as 700w, then realized it was only 460w and did not have enough amps per 12V rail to run the k8we with SLI vid cards and 4 sata's etc. So, I ended up with a 750w/950w peak SNE power supply.
Check out a review here http://www.xbitlabs.com/news/o...play...1126101213.html
' ">http://www.xbitlabs.com/news/o...ay/20041126101213.html. I suggest you find a similar supply in the states. The trick is to look at how the 12v rails are distributed across the power cables and mobo. With this PSU, I can easily have each nVidia 6800 on a different 12v rail and have room for 4 or more SATA or scsi drives or whatever flicks my bic.
Beware of the new "SLI" PSU's popping up all over. The ones I saw cannot power dual Opterons, dual 100w graphics cards and lots of drives. Check the amps on each 12v rail of each PSU you look at and you will figure it out.