I have a Corsair HX850, an OCZ ModXtreme 700watt, an OCZ StealthXtreme 400watt and I recently helped a freind build a rig with an OCZ StealthXtreme 500watt. I have never run into any problems with any of them. I also find the OCZ power supplies to run very quietly, which is a bonus. I think that Corsair is good if you've got the money, but OCZ are great if you are trying to build a rig with slightly less money. I think that both should be options you consider.