I have a pair of Dell 22" FPDs I've been using since September when I bought a new desktop. The 2nd monitor was on sale. They're nice. I'm very pleased with them.
Both are plugged into the video card that came with the new system. It has one DVI port and one VGA port. If I really concentrate I can see a slight difference between the one getting the digital signal and the one getting the analog signal - but for the most part they look the same.
When comparing pricing of monitors check the warranty. These came with a 3 year warranty. Some monitors with comparable specs that appeared cheaper had a one year warranty. When adding extra warranty time, the prices ended up comparable and in some cases the "cheaper" system was higher priced with a comparable warranty. Of course, you may prefer to save a few bucks by only having a one year warranty.
Also, check to see whether the cables you need come with the system. These Dell monitors came with both a digital cable and an analog cable. Some monitors don't include a cable to enable them to have a lower retail price. So when pricing a system check if their are extra's you need to buy.
Do you need/want a speaker(s)? Some monitors have them built-in while others they are an optional extra. If you're using them with an existing system and already have speakers, its a non-issue. I bought the Dell sound bar that attached to the bottom of one of the monitors since the new computer didn't come with a speaker, I didn't care about better sound, and liked not using my desktop space for the speakers from the system I was replacing.
There were 22" monitors for less with lower specs and ones with better specs that cost more. However, between the discount for the monitor that was part of the new desktop system, the sale pricing for the 2nd monitor, the 3 year warranty and the cables, the Dells seemed like the best buy compared to pricing for other 22" FPD's with comparable specs.
Good Luck