Perhaps one of the biggest reasons why a simple answer to, "What monitor to buy" is hard to find here is because its really as complex as asking, "What computer to buy." There are a lot of things to consider in figuring out what type of monitor is right for you.
First, what is your intended usage from your monitors? For instance, do you just want to be able to view high resolutions for more work area, or is color calibration critical for printed media?
Second, what is your ideal size or setup for your displays? Would you prefer to have two (or more) smaller monitors together as one extended desktop, or just a single larger monitor? What size would you like?
Third, what is your ideal budget for displays? Your standard LCD/LED monitors can work just fine for the average design usage, but it becomes a little more flaky when dealing with exact color coordination between several computers and printers. If this is something your business needs then you are more apt to needing a higher end design monitor and calibration system.
At our office, we just recently purchased several Dell U2410 ultrasharp monitors. They are about $500 each. At first it was very iffy whether the monitors really warranted the extra cost. After all, they were twice the cost of some of the nice Samsung 24" monitors were also looking at. However, once we noticed their color quality, their build quality, their connection options, and their extended warranties (5 year standard versus the majority being 1 or 2 year standard) it was obvious we made a good choice.
However, if you don't think you need to step into the higher quality IPS design monitors yourself, or just can't warrant their expenses, there are still several great quality monitors out there for cheaper. The best price range right now is for monitors in the 20" to 24" size range. From personal experience ordering and having to replace out monitors I would only purchase three brands: Samsung, LG, or Acer. We have used some Acer monitors at our shop as well and some have lasted for years while a few of the Acer monitors died just after the first year. Still, they have good quality for a low price.
Things to keep an eye on if you are looking into monitors:
Native Resolution: This is the resolution the monitor displays best at, which is also its highest supported resolution. If you want a large display but it only supports 1600 X 900 display you will have a smaller desktop area than a monitor that supports 1920 X 1080.
Response Time: Lower response times mean faster response to images on the display. Really there is not much difference here, but I would recommend on a non-IPS display you want to have a response time of 5 ms or less for the best viewing quality.
Connections: What type of video inputs can the monitor support? Does it only have VGA connections, or DVI? Many newer and nicer monitors are starting to support a plethora of connections such as DisplayPort, Component, and more which allow you more freedom to connect different devices if needed.