Soldato
I'm using a Corsair 550w PSU (forget the exact model number) in a system that was built in November 2008. I'd say I've got my moneys worth out of it. Same for all the components.
its a good bet that it's a VX550, I believe it was the first of many PSU's made for Corsair by CWT. They did go down in quality a bit after that model, but when JonnyGuru himself started working for Corsair & he is now Director of their PSU engineering section, I would give serious thought about buying Corsair PSU's again.