I just discovered the be quiet! Dark Power Pro 12 PSU and after watching their video Dark Power Pro 12 | Product Presentation | be quiet! - YouTube, i want to have it badly 
not only for its constant power delivery but also because it has 16x SATA and 8x MOLEX connectors which is great for my 20 HDDs rig.
Currently i use a Corsair CS750M with 8x SATA connectors only with bunch of splitters 
Is anyone here using the Dark Power one ?