The better graphics card you choose, the higher detail settings you can select.
Your maximum frame rate may be limited by your CPU in some situations, but picking a faster or slower GPU won't change this.
For 1920x1080 resolution, the GeForce GTX 770 or Radeon R9 280X will allow the highest detail settings.
Other cards that will give you medium to high detail settings, from slowest to fastest; GTX 750 Ti, R9 270, GTX 760, R9 270X, R9 280, R9 285. R9 cards are AMD Radeon, GTX cards are Nvidia GeForce.