Suitable Graphics Card For My PC

Hi

Can any one tell me which is the good graphics card for my desktop the desktop configuration is:

Processor: Amd fx6300
Motherboard: Gigabyte GA-MA78LMT-USB3
Ram: Corsior 4GB DDR3 1600MHZ
HDD:Seagate 1TB
PSU : I can replace

Please give your vanuable suggestion.

Thanks