Battlefield 4 Card - $150 to $200
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GTX 650 Ti Boost
HD 7850
Battlefield 4 Card - Around $300
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GTX 760
HD 7950
Battlefield 4 Card - Around $400
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GTX 770
R9 280X
Battlefield 4 Card - Around $1,000
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GTX 780!!
You can choose any of the engines above but when it comes to brand, I would suggest you to choose any one of the following -
MSI, EVGA and Sapphire.