Acer Predator XB273K G-SYNC Compatible 120Hz 4K 27" IPS Monitor $630 at Amazon

27" WQHD (2560 x 1440) widescreen IPS zero frame monitor with AMD Radeon freesync technology, Response time: 1ms VRB & refresh rate: 144Hz, 2 speakers, 2 watts per speaker, Displays 400, DCI-P3 & low Delta e<2, Ports: 1 x Display Port, 2 x HDMI 2.0 & 4 x USB 3.0 Ports (includes HDMI & USB cable), Note: The incorrect resolution or an out of date video can cause the screen to appear blurry and screen flickering. After adjusting to the correct resolution and updating the video driver, restart the computer and to fix the screen, Please refer user manual before use

28" UHD (3840 x 2160) Widescreen IPS Zero Frame Monitor with AMD FreeSync Technology, Color Saturation: DCI-P3 90% | 100% sRGB | Supports HDR10 Format | 1.07 Billion Colors, Pixrl Pitch: 0.16mm | Brightness: 300 cd/m2 | 4ms | 60Hz Refresh Rate, Ergonomic Tilt: -5° to 20° | 2 Speakers, 2 Watts Per Speaker, Ports: 1 x Display Port and 2 x HDMI 2.0 (HDMI Cable Included)

23.8 inches Full HD (1920 x 1080) Widescreen IPS Monitor with AMD Radeon FreeSync Technology, Response time: 1ms VRB, Refresh rate: 144 hertz, Zero frame design, Ports: 1 x display port & 2 x HDMI 2.0 (HDMI cable included)

Fighting Fast: A 144Hz refresh rate combined with a 1ms (MPRT) response time eliminates motion blur and allows fast-moving visuals to be seen with incredible clarity., Fluid and Smooth: Nvidia G-SYNC Compatible Certification and AMD FreeSync Premium technology minimizes graphic distortions like screen tearing and stuttering for smoother, fluid gameplay and extraordinary image quality., Perfectly positioned: The height- and tilt-adjustability lets you game in comfort for extended periods.