Best answer: G sync is not your worry here, it's more of what your frame rate will be. With an i5 and a 1060 I recommend sticking with a 1080 p screen.
1440 is going to be too demanding and you will not be able to really reach 144hz. Get a nice 1080p monitor with g sync, 144hz.
G sync will make lower frame rates look smooth, but the idea is too stay at high frame rates and use g sync if you need too.
For your own sake and for your wallets, stay at 1080p and you will enjoy gaming on PC much much more.
144hz at 1080 looks better then 60 at 1440. Believe me.
If you have more questions just ask!!!
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