Amd vs Nvdia

Solution
Get the R9 280x though, the 128-bit wide interface on 960 will cost you in game performance.The 3 gigs of VRAM should be healthy for now,assuming you're not Ultra gaming all the way.
These guys tested the Gtx 960 and the R9 280X
http://wccftech.com/nvidia-geforce-gtx-960-radeon-r9-280-4k-benchmarks/
I really can't recommend either. I would rather you go for a R9 280 or a R9 280x as it actually beats the GTX 960. But if you really have to choose between the two, go for the R9 270x. Save a few bucks cause the fps gained isn't worth the extra money.
 
Get the R9 280x though, the 128-bit wide interface on 960 will cost you in game performance.The 3 gigs of VRAM should be healthy for now,assuming you're not Ultra gaming all the way.
These guys tested the Gtx 960 and the R9 280X
http://wccftech.com/nvidia-geforce-gtx-960-radeon-r9-280-4k-benchmarks/
 
Solution