One monitor that I frequently use is the Dell E156FP. I have a Windows Server for AD DS and if there is a hardware issue that I have to troubleshoot, the Dell E156FP makes it easy to do so from the output of the error message on the screen.
One useful feature of the Dell E156FP is the OSD Lock. With the locking feature on, the settings can not be changed to make sure it is the same when you return. This will be covered in the lock and unlock article.
Instead of turning on and off the monitor each time and wear out the power button, the Dell E156FP will go into sleep mode once the OS tells it to do so. This prevents screen burns (which can damage the LCD) and the reduce your electricity consumption.
The Dell E156FP has builtin support for VGA making it great for old and modern desktop use. Some newer laptops, unfortunately, will not be compatible with the monitor due to the fact that they are dropping VGA support for HDMI so make sure that your device supports VGA output if you plan to purchase the Dell E156FP.