I'm currently looking at the $290 Philips 276E8FJAB and the $258 ASUS PB277Q that are both 1440p, 27", and no G-Sync/Freesync. The Asus is 75hz while the Phillips is 60hz. Besides the obvious higher refresh rates, cooler designs, and G-Sync/Freesync; What am I missing out on with monitors like the Acer Predator XB271HU? What makes a monitor like that worth so much? I have a GTX 1070 so G-Sync would be nice but not necessary. And what about 4k? I would like a monitor that is 27"-~30" so is it better to invest in a 4k monitor since I'm looking to upgrade anyways? As a side note in the future I'd like to have a dual monitor setup when I get more desk space and I also need both a DisplayPort and HDMI out.