I’ve never really been a fan of buying a monitor, I tend to only look at three key aspects; screen size, resolution and the overall appearance. While that is generally a good way to choose a monitor, there are a multitude of other features that require your attention depending on your intended use.
If you are a gamer or avid video editor, the response time and refresh rates would be of key interest to you to ensure that there is little input lag from your input device and that there is little screen tearing. Professional photograph editors may be less interested in those features, where the contrast ratio, brightness and available colours are more important.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips