Alienware QD-OLED 3440x1440 monitor (21:9 aspect ratio). Will do 144Hz in HDR and 175Hz in non-HDR if you don't want chroma sub-sampling. Basically, it's among the highest-quality panels that you can buy. I don't care much about the Alienware brand, but the panel is made by Samsung. OLEDs have a pixel response time of 0.1ms (basically nearly instant) and pure blacks. The HDR1000 and HDR400 true black certifications make for a great-quality picture. The monitor is also color calibrated at the factory and you are provided the calibration specs in the box.
https://www.dell.com/en-us/shop/alie...or-accessories
There's an MSI alternative, but it doesn't have Gsync as the Alienware monitor does.