The Dell G3223Q is an excellent option. The G3223Q is a 32-inch, 4K monitor with a maximum refresh rate of 144Hz and support for AMD FreeSync Premium Pro (Nvidia G-Sync also works, unofficially).

You don’t realize how much your monitor’s holding you back—until you switch to something like the Dell G3223Q. With a 32-inch 4K display, a 144Hz refresh rate, and a 1ms response time ...

The P2725QE's 27-inch (measured diagonally) screen, bordered on all sides by ultra-thin bezels, has UHD, aka 4K native resolution ... strong ergonomics on Dell monitors, and the P2725QE is ...