The ASUS ROG Swift PG279Q is one of the best 1440p monitor you can buy this year, and you can buy it today from Amazon for only $520.
The ASUS ROG Swift PG279Q offers 27-inch IPS flat panel, 2560 x 1440 QuadHD resolution, 16:9 aspect ratio, 165hz variable refresh rate via DisplayPort input, 350nits brightness, 1000:1 contrast ratio, 4ms response time, excellent wide viewing angles, Flicker-free, NVIDIA G-Sync support, Low Blue Light, HDCP support, 100% sRGB wide color gamut, two 2W built-in audio speakers, and other ASUS EyeCare technologies.
NOTE: the HDMI port only goes only up to 60Hz refresh rate.
The stand that comes with this monitor allows users to adjust its tilt, swivel, pivot and height position. If you're using a wall/ desk mount then you should know that the monitor is VESA 100x100 compatible. The Amazon price has dropped today to $520 for a renewed model.