I'm building an new system that will have a P II X6 1075T and the usual other stuff. Midrange graphics card, probably a 5770. I currently have a earthwatts 650 in my Q6600 system that I can use and I also have a Neo Eco 620 that I just got from newegg when they had them for 35.00 AR. Is there any appreciable difference in either of these PS? Any good reason to pick on over the other?