I use a Samsung 28” 4k - similar to https://www.samsung.com/uk/business/monitors/monitor-ue590-lu28e590dsen/lu28e590dsen/ - which is around the price you’re looking for. It is bright (370cd/m2) and has great image quality.
This has FreeSync technology so you don’t get image tearing and stutter during gaming on AMD cards. Therefore, the only disadvantage is that you would have to get an AMD based gaming system, not Nvidia, if you want the variable refresh rate. It makes a massive difference to games and is also supported by Xbox. The equivalent for Nvidia cards is G-Sync, and it is much more expensive to get a monitor that supports this.