Of the two PSU's there I would personally purchase the PC Power & Cooling PPCMK2S75 because of the review found here HardwareSecrets PSU review PP&C MkII 750 (linked to conclusion page). Also of note are the other PSU's listed as viable options there. I could only find reviews for the lower wattage Corsair CX models and am reluctant to infere anything from those since the PSU architecture would be different for higher wattages.
My $0.02
Of the two PSU's there I would personally purchase the PC Power & Cooling PPCMK2S75 because of the review found here HardwareSecrets PSU review PP&C MkII 750 (linked to conclusion page). Also of note are the other PSU's listed as viable options there. I could only find reviews for the lower wattage Corsair CX models and am reluctant to infere anything from those since the PSU architecture would be different for higher wattages.
My $0.02