TX950 is way overkill, but if you can afford it, go for it. It will allow for CFX or even triple CFX in the future. The Thermaltake Frio OCK 0575 is a beast! Very loud though, and im not a noise snob. I dont mind it, but some would. If you dont plan on CFX, you can get an HX650W, or an Antec 750W EarthWatt psu for your system, and save some money. Best of luck!
If you want to objectively, accurately and scientifically determine what PSU power is required for your Vid card and PC in both watts and 12v rail amps., the forum Utility link below will show you how easy it is to calculate this information and objectively determine which PSUs are quality built, reliable PSUs that can meet your needs. Be advised that the available 12v rail amps. is just as important as the total PSU wattage. You need both to be correct.