I have a Seasonic 460 and a powermeter.
Enough said, that thing pays for itself
(In case this is too obscure, the Seasonic parts are much more efficient. Mine takes 10% less power than even my Zalmann which isn't bad to start from. Since that computer is running permanently I save about 20 bucks a year and I expect at least 4 years out of it).
Plus it's very quiet, PCIe ready, 24 and 20 pin, blah blah blah. A PSU is the right place to throw some money on quality.