The Corsair CS850M is a quiet and very affordable mainstream 850 Watt power supply that is 80-plus certified, that means it's 90% efficient at 50% load. Efficiency matters. The PSU itself is partly modular, for most of you with a side panel window in their chassis a must really as you'll want modular cables. The new PSU also improved on the silence factor. Have a peek at the article.
Read the review here.