I think the leaders of this review are the Antec Neo HE 550, Cooler Master Real Power Pro RS-850-EMBA, Seasonic M12 SS-700HM, and the three models from Thermaltake.
The first three of them are high-quality and exceptionally quiet power supplies. If you want not only top-performance but also a quiet PC, you should consider them. These models are each nearly silent under low loads and do not become irritating at high loads.
Thermaltake’s PSUs feature superb electrical characteristics but are not quiet. They are rather average in terms of noise. Oddly enough, the 850W Toughpower is generally louder than the 550W and 600W models from the same brand, which refutes the widespread opinion that a PSU with a higher wattage rating is going to be quieter than a lower-wattage model under the same load.
The Zalman PSUs would fit into the quiet models category well enough if it were not for the poor stability of their output voltages.
The FSP Epsilons have a couple other drawbacks besides the mentioned instability (the Zalman models are actually based on this platform from FSP). First, they do not fit within the allowable maximum of the output voltage ripple. And second, they are rather noisy at work. So, although I was very pleased with first models from the Epsilon series, the development of the series has taken a wrong way since then.
The Etasis PSU had serious problems with overheat. The fact that it endured a temperature increase of 25°C indicates a large margin of safety, yet a more powerful fan would do it good.
The PSUs from Floston and Ultra are sturdy midrange products. They don’t set any records, but deliver their specified parameters. If you don’t have any specific requirements, these models will be a reasonable choice.
The Rosewill power supply is somewhat odd due its combination of an outdated circuit design (particularly, it is the single model in this review to lack Power Factor Correction) with a fashionable 135mm fan which does not give this PSU any advantages. This model is average even in terms of noise.