Which Is Better

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iirc a 280x is better than a 960, but a 960's very efficient and should be adequate for gaming on a single 1080 display.

there are people around here that really don't like that Corsair CX series, and for right between those 2 PSU prices you can get a +80 GOLD certified EVGA G2 500w PSU which is of impeccible build quality and 10yr warranty.
iirc a 280x is better than a 960, but a 960's very efficient and should be adequate for gaming on a single 1080 display.

there are people around here that really don't like that Corsair CX series, and for right between those 2 PSU prices you can get a +80 GOLD certified EVGA G2 500w PSU which is of impeccible build quality and 10yr warranty.
 
Solution