Not trying to bash on 120hz monitors, but in most cases, the human eye cannot even see over 30hz, and many standard monitors now are at about 60mz. I'm not sure there is a price difference between the monitors, but if there is, don't limit your choices just to 120hz. Also, if your computer cannot run the games at 120fps, there is no point to buy a monitor that has such a high frame rate cap. In my opinion, look around for any cheap monitor that has at least a 1920x1080 resolution, good viewing angles, and low input lag so that the monitor is responsive and does not ghost when fast actions are being performed (2ms is usually the best, but 5ms is good too). It would also help to know what your budget is to help recommend some good ones.