three monitor vid card set up

[mkedglss]

What would be best for three monitor gaming?
2 GTX 770's http://www.newegg.com/Product/Product.aspx?Item=N82E16814125463
1 GTX 780 Ti http://www.newegg.com/Product/Product.aspx?Item=N82E16814487003
or 1 R9 290X http://www.newegg.com/Product/Product.aspx?Item=N82E16814125499
I only want to spend seven to eight hundred.

 

[Ahmadjon]

780ti and R9 290X will be almost equal, but get 290 if you can then you can switch to 4k res.