PSU quality... Edge < LG / Dell < Iiyama < Samsung < NEC SONY < Eizo.
You CAN get good Dell monitors quite reasonably with 3yr warranty, do a Google or Ebay, also check places like
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and similar.
Check what panel comes with the monitor if you plan on graphics work because IPS > PVA > TN. A TN panel is 6-bit and uses various tricks to simulate 8-bit colour (255 shades each of red, green & blue); PVA & IPS are 8-bit panels and can deliver the true spectrum of colours. IPS is used on the best LCD TV and gets close to Plasma (unless the Plasma is one of the now sadly gone Pioneer specials), PVA is more poster- paint colour in vibrancy sort of like Sony Trinitron compared to better Panasonic Tau. TN is simply bargain bucket and can vary considerably based on who made the actual panel. PVA tends to be more power hungry than IPS or TN, ie, it requires a more powerful and deeper backlight design. LED backlights are power power efficient and can be brighter (more useful for laptops). Like a CRT the backlight brightness of CCFL diminishes with time - I think the figure is a halving of brightness after 30,000hrs, can not recall.
LG (Lucky Goldstar renamed) tend to have weak power supplies, but warranty used to be 3yr. Samsung have better panels and better PSU, but are still a "low brand" compared to the "real" monitor makers of old. Eizo are very good, but avoid unless you have critical graphics work because you are paying a high premium for the "better backlight design & better psu".
A monitor is the sum of the parts, they are not quite "all the same" - some bad displays look like a load of spot-lights shining every few inches with the screen black. Likewise graphics card & even drivers can affect the end video quality - some are better than others.
There is a german review website on monitors. If you have poor eyesight or intend to use the monitor a lot of hours then buy a higher quality monitor, IPS panel.
Your graphics card must match the panel, if you right-click on the windows desktop and go through graphics settings to see the available resolutions like 1280x1024 1600x1200 etc.