Welcome to the forums!
Need just a little more info here.... Pac Display can run on just about any modern PC and monitor, so there should be no worries about selecting a specific monitor just for Pac Display..... The only thing you have to watch out for is if you have an existing Display project and want to run that on the new PC. Windows DLL's do not let PAC Display resize its windows to just any screen resolution, so if you have an existing project built for a specific monitor resolution, you should aim to get that size or bigger to save yourself the work of manually resizing the elements on each window.
Other than that, pick a solid PC and you are good to go (unless I am miss reading your post).