https://www.pcgamer.com/best-gaming-monitor/

We're now several months into 2018, but our pick for the best gaming monitor hasn't changed. The best gaming monitor is the Asus ROG Swift PG279Q.  It combines 1440p with 144Hz refresh rate, overclockable to 165Hz, and has G-Sync to keep your gameplay smooth.

Asus and Acer are expected to roll out new 27-inch 4K HDR 144Hz G-Sync monitors later this year—essentially 4K HDR versions of our top pick here. Those monitors are going to be fantastic, but they're also expected to cost more than $2,000. Unless you just won the lottery and have a mountain of cash to burn, we stand by our recommendation of the Asus PG279Q.