Best graphics solution for under $500 surround gaming?

I have a budget of $500, what is the best graphics card I should look at for surround gaming?

Resolution will be 5760*1080, don't care about 3D

My current graphics card is a single GTX 460

possible choices:
single GTX680
single GTX670
single 7970
2x 7870
2x GTX660

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