If you're looking for a very affordable gaming monitor, you can't go wrong with the ASUS VW22AT-CSM monitor. It has a great response time of 5ms, which makes fast action scenes smooth and lag-free. The 1680x1050 resolution ensures that fast action scenes look great on the screen.
This monitor also comes with various connectivity options, including DVI and VGA ports which will allow you to connect your device easily to the display. An aspect ratio of 16:10 ensures that you get multiple windows open at once and compare different windows side by side without any issues.