Get a PSU by OCZ or PC P&C if you can afford it. I got one by antec, which are also good. I'd say get one about 500W or more. Look for a good amperage on the 12V rail, at least in the mid-upper 20's.
This is the one I got. http://www.newegg.com/Product/Produc...82E16817103932
If you can afford it, you couldnt go wrong with this one.
This may or may not improve your scores, but i would still get a new PSU anyway cuz yours kinda sucks.
off topic: i think i remember playing with you before. There are so many people playing so names get kinda hard to remember
Im gonna start playing right now.