I am looking at this PSU:http://www.newegg.com/Product/Product.aspx?Item=N82E16817182188
and I'm not sure about my motherboard, I opened my computer up earlier but didnt check for the brand of the motherboard. My resolution is set to 1680x1050
I think that's what I use in WoW, too. Although I think i've played at 1920x1080. 1680x1050, though.
I used to be able to play at "good" settings or just above it, but now I am playing at low settings.