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Are you going for absolute maximum speed you can get out of the card or do you just want it to work?
G1 Gaming is an absolute beast, it costs slightly more generally (not too sure on current prices), but you can't go wrong with the 6G - Fast out of the box and very quiet.
My msi isn't a great clocker, (1489mhz max). But the beauty is you can set the fans quite high and its still very quiet. 80% on the msi is much quieter than 60% on the windforce 780's I had.If you're not going to overclock, go for the MSI.
It's quieter and it's less risky to get one that whines (only problem is the cooler is not very efficient as they kept the same from the 980, so extra overclocks might get the card too hot - compared to the cooler G1).
See I find that way too low the lowest I would go on that res with the x34 allowing for 100hz is 70 with g sync it starts to feel quite laggy below that
ideally at that res 2 980ti's would be perfect