Corsair HX1000W @[H]OCP.
QUOTE
The Corsair HX1000W is the largest capacity power supply from Corsair to date and by most metrics it is also Corsair’s best power supply to date. The HX1000W features very good voltage regulation, excellent DC output quality, a good noise profile given the units capacity, and an amazing build quality that features solid capacitors on the secondary.
Hiper Type M 580W @jonnyguru
QUOTE
The Hiper Type M 580W is a relic of days gone by, when you needed the 5V rail to power your Pentium III, gas in Canada cost under a buck a liter, and you were sitting around watching Xena: Warrior Princess on a dull Saturday. Or was that just me? Although admittedly quite the knockout (the PSU or Xena, works either way), this power supply suffers from poor cooling and a low ceiling on the two 12V rails. Consider it a good but not great 450W power supply - no more.