I'm planning to upgrade my graphics card in the next month or so and would like some recommendations from the AOD community.

My current specs:
AMD FX-6100 processor
MSI 970A-G46 mainboard
16 GB DDR3 memory
nVidia GeForce GTX 650
PC Power & Cooling Silencer 910 W PSU

My budget is in the $300 (USD) range and I would like to stick with nVidia, but am willing to entertain AMD suggestions. Let me know what the rest of you think.

JA