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Power Supply Unit for HP Pavilion Elite Desktop?

I need a power supply unit with at least 550 watts for my HP Pavilion Elite Desktop. It has a quad core processor, 2.40 Ghz, 3 gb memory, with a 1 gb NVidia GeForce 9500 GT. I was wondering what the best PSU would be for my PC. It needs to be affordable, but high quality.

Public Comments

1. I have always found Corsair to be the best combination of price and quality. Link below is for a UK supplier but same is available anywhere. Antec are also well thought of, but not used them myself as I stick to Corsair.