You'll be fine at 1440p, on heavier titles you also have the option of DLSS and FSR when it's available.
As for the monitor there's lots of decent options atm, i'd suggest whatever IPS display with a 144-165hz refresh rate you can get the best deal on. Don't be shy with lesser brands as they often use the same panel as much more expensive monitors, find one you like then have a look at some reviews.