GTX 770 2gb sli.question.

Vitric9

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I have a PNY GTX 770 2gb. Good Card. But I am a "shameless graphics fanatic" and like 60= FPS on every title. I would like a R 290X or GTX 780 ti but I am not made of money though next month I will have enough Saved up in my PC funds to get another 770. So I am stuck between Getting the PNY one which is the cheapest. Or the Gigabyte one :http://www.newegg.ca/Product/Product.aspx?Item=N82E16814125463....and finally One from EVGA which there are a few. Two of which are SC w ACX cooling. I would like to have the one which has the best power design and just basically puts more power to the GPU.