Nvidia has been a leader in high performance as well as quality when it comes to their video cards. I recently installed the Nvidia GeForce GTX 770 2GB GDDR5 PCI-Express Video Card – One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One Display Port into a custom built Intel I7-4290 CPU on a Gigabyte Motherboard along with a SSD. This combination has produce outstanding performance resulting in games such as Counter Strike pushing out 500 to 600 FPS on a standard cable internet line.
The power supply was a Corsair CX series CX750 750 watts which is ample amount of power for the configuration that was used. You can visit this link to view the various testing that was done against some of the other video cards available at this time.
The price at this point is under $300 for the GEForce GTX 770 due to the ever changing market but if you need the performance at this point this card is highly recommended.