The FSP group, also known as Fortron, makes pretty good PSUs. Their main business though is being making PSUs for others as they are one of the few PSU manufacturing companies. Despite the fact that they generally make high quality and efficient PSUs, they have not been too successful in marketing their brand and have lately been eclipsed on the top end by others. Check out PSU tiers to see how various PSUs comparehttp://www.xtremesystems.org/forums/showthread.php?t=108088
The Blue Storm II was among the most stable and efficient 450-600W PSUs when it came out. It's hard to beat at it's current price.