Seasonic X Series 760W
 

The Seasonic X-Series 760W power supply comes well packaged with a great set of accessories. I don't know why, but it just oozes quality when you pick it up and on further inspection the build quality is confirmed. I'm not a fan of fully modular power supplies, I can't see the point of a modular motherboard cable for example, but it works here and works very well.

http://www.overclockersclub.com/reviews/sea_x_760w/