Ultimately, the best size for a gaming monitor depends on your needs (the games you want to play, the distance from yourself and the monitor, and what you consider a decent trade-off between size ...

MSI Pro MP223 21.45 Inch Full HD Office LCD Monitor - 1920 X 1080, 100 Hz, Eye-Friendly Screen, Vesa Mountable, Display Kit Support, Tilt-Adjustable - Hdmi 1.4B, D-Sub (Vga) View Details Monitors ...