I have the Acer XR382CQK, it’s a 37.5” curved ultrawide monitor with a 3840x1600 resolution and Freesync and a 75Hz refresh rate. If you keep an eye out you can find it for £800 or so but make sure you get the newer version with speakers. For productivity tasks it’s amazing as you scan split the screen, connect multiple computers at once, and gaming in ultrawide is really immersive. It’s the same panel as the more expensive LG38UC99 which sells for much more.
Because it’s only about 75% of the pixels of a 4K monitor it’s easier to get higher frame rates than a 4K monitor. Most affordable 4K monitors are limited to 60Hz and even a RTX2080ti will still probably struggle to get that in AAA games at 60fps with Ultra settings.