If money is no object, then you should also take a look at the Seasonic X Series and the Corsair AX series of PSUs.
Seasonic X750: http://www.newegg.com/Product/Product.aspx?Item=N82E16817151087
Corsair AX750: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139016
+1 - Seasonic has excellent variable speed fan technology. The fan on my X650 Gold almost never turns on unless under full load.
Kingwin Lazer Platinum 750W,
as it also has the semi-fanless feature, but it's maximum speed is lower than on the Seasonic X series at the same wattage level (1300RPM vs 1600/1800RPM).
The more efficient PS you get the less heat will be generated - fans will not come on as hard or as often. My question - what will do you do about the noise from cpu/gps?
-Bruce