You might want to consider the R9 280X Toxic or Vapor-X, the R9 280 Dual X is also a solid choice. Both cards have extra VRAM, the 280x equals the GTX770 and the 280 the 960, and both are $229 and $169 after rebate, respectively.
I have i5 4440 with GTX 960
I play AC UNITY, Hitman blood money, absolution, Assasiins creed 4
At high setting 60fps stable
But for unity i have to make a medium deal
You might want to consider the R9 280X Toxic or Vapor-X, the R9 280 Dual X is also a solid choice. Both cards have extra VRAM, the 280x equals the GTX770 and the 280 the 960, and both are $229 and $169 after rebate, respectively.