The antec seems to be better quality but 750 is the bare min. or 1 watt short depending on which psu calc I use..
Corsair calc
Load Wattage: 664 W
Recommended PSU Wattage: 714
http://powersupplycalculator.net/
Load power: 626 W
Recommended power supply: 776 W
Corsair calc
Load Wattage: 664 W
Recommended PSU Wattage: 714
http://powersupplycalculator.net/
Load power: 626 W
Recommended power supply: 776 W