Unlike most gadgets and peripherals, our computer monitors tend to stay with us for a good chunk of time. My current 23-incher has been with me since the days of my Palm Centro. So when it comes to shopping for a new display, it certainly pays to know what you want out of it. Are you heavily into gaming and need a monitor with crazy-high refresh rates? Would you rather have as big a screen as possible for all those windows you have open every day? I recently spent a month with two of AOC's latest models: a 24-incher with NVIDIA G-Sync support for serious gaming, and a 4K 28-inch display that puts a premium on pixels. Could either one convince me to let go of my trusty Viewsonic?