Will this be used with an AMD GPU?
I think it would be good for a 1070 with its high-end specs but it's designed for use with an AMD GFX card. I'm not saying it won't get along with a 1070. Quite the opposite really. The freesync will just be something that won't be used.
If you do choose that model head on over to
https://jet.com/product/Acer-XG270HU-27-inch-Wide-Screen-LED-Monitor-with-built-in-speakers/c94ce5c47da94cc59aa021dc1a5f10e6 Make sure you enter your promo code
spring15 at checkout. That'll be about $65 off their price. Not too shabby. That's about $100 off MSRP.
With its low latency and high refresh rate it'll be great for buttery smooth online gaming(assuming you have a low ping on your end).
You can use http://www.lagom.nl/lcd-test/? to dial in the best image for your liking.