The GTX980TI replaced the 780TI and is the current top of the line GPU from Nvidia but not for much longer. the 1080 will be released later this week and I would expect a 1080TI to follow not too long after. As of right now, the recommended card is the 980TI. They tend to retail for around 600USD and you shouldnt have any problem finding one. Based on the configuration of the computer as a whole, I have seen them score anywhere from 80's/100 to 160's/100 on the CC benchmark. All of the cards you mentioned would be pretty decent with the exception of the k1200. The 970 is probably going to be the best bang for your buck. They tend to retail for around 300USD and will score about the same as the M5000/M4000 or W5100. The W8100 should be in the 980TI range, but for almost double the price.
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