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Nice, go for it, I say.
I'd agree. It's the G-Sync monitor that has meant I'm in the same boat as the OP. I can't justify those prices for the difference it would make, the G-Sync has certainly extended the life of this 1070 to the point where it has to be at least a 1080ti/2080 if I'm to get something new.
It'll probably be some time this year, but not until prices have become realistic. In theory, I could buy a few of these cards. But as an old footy manager used to say, "no value in the market" so my money is staying firmly in my pocket, for now..