Review for EVGA NEX that should put you off it:http://www.techpowerup.com/reviews/EVGA/NEX750G/
The XFX P1-750X-XXB9 is a rebranded Seasonic M12II Bronze (SS-xxxAM), which is basically the modular version of what is used in the Corsair TX750 V2. They perform well enough, and their quality it high enough. However their minimum fan speed is 1000RPM, so not that quiet.
If you were willing to take the Seasonic X-650 (SS-650KM), then I don't see why this wouldn't be good enough for you either:
Rosewill Capstone-650M ($110 @ Newegg)http://pcpartpicker.com/part/rosewill-power-supply-capstone650m