Monitors for computers are just television screens with more precision and connection options. The more you pay, with some exceptions, the more precision and options you get. You only need spend a lot of money if you want to reduce eye strain or create accurate colours.
LCD is the current fashion and is already made obsolete by OLED. CRTs are obsolete but a good CRT has better colour accuracy than your new LCD screen. With a little bit of care and extra knowledge, you can make a great choice for your next purchase and the one after that should be OLED.
The screen types
CRT, Cathode Ray Tube, was invented over 110 years ago. The first television display was demonstrated more than 100 years ago. CRTs are really easy to use but good accurate reliable colour CRTs are a pain to build. The early CRTS burnt out quickly for the same reason electric light bulbs burn out. Then someone invented a cathode that did not burn out. Accurate colour required the invention of rare earth phosphors. There were many problems and they were all solved by the 1990s. prices dropped. We could afford huge accurate colour CRTs.
Big CRTs weigh too much for one person and are an OHS, Occupational, Health, and Safety, issue. LCD solved the OHS issue. My 26" LCD weighs about a third of the weight of my last 19" CRT.
LCD screens are the equivalent of sunglasses. You have a big bright light panel then the LCD reduces the brightness. Colour LCD screens filter red, green, and blue separately. When you see a bright white, you see a bright red spot, a bright green spot, and a bright blue spot next to each other. You see only a third of the fierce light behind the LCD. What a waste of energy.
OLED emits light directly in a similar way to LED. You use only the energy required to produce the light. Nothing is wasted. OLED is about twice as efficient as the average LCD. OLED manufacturers are still working on making the blue colour last longer because the current blue light emitter starts to fade after 5 years use at 8 hours per day. That is only 2 years for a typical Web developer working 20 hours per day.