I'd second Marc's comment about the Dells. For a new setup I recently added a couple of UP2716D wide gamut monitors, and they're now working well. That said, initially I was disappointed as they have terrible uniformity issues when uniformity compensation is turned off. Poor uniformity is typical for many wide gamut displays, and the UC is permanently disabled in the modes such as its native sRGB emulation, making them barely fit for any purpose unless colour blind.
In their custom colour settings mode the Dell UC is also disabled if you adjust anything other than brightness, but that's the only adjustment necessary to get them to 120cd/m and to calibrate with an xrite i1 display pro to 99.5% or higher sRGB, definitely helped by being wide gamut. Now that they're calibrated they are nice to work with and give a great image. A downside if you do consider wide gamut is that calibrating will be incorrect unless you have a valid correction matrix (data for the correction software) corresponding to the monitor backlight technology. With the correction software I use for example, even after importing xrite manufacturer corrections, I needed to obtain a correction matrix from a different source, and of the two claimed to be for the UP2716D, one gave a clearly faulty result. From using a variety of test images imported into a project timeline, the other matrix appears to result in a valid calibration, or a believable one at least.
If you don't have a calibration tool yet, I'd also highly recommend the xrite i1 display pro as a very fast and capable unit. Even if offered one for free, do not use a Spyder (e.g. Spyder 5) as they are a disaster in comparison, and claimed to be unable to handle any type of monitor using GB backlight technology along with having "extremely innacurate spectral correction" (sic) for other more common technologies. Ref: Yumichan, Dell forum link below. I also own a Spyder and it is super slow. The i1 vs spyder is like a Porsche compared to this
These articles and discussions were illuminating when exploring the topic of wide gamut and worth reading regardless of your vendor choice.
https://photographylife.com/how-to-cali ... t-monitorshttp://en.community.dell.com/support-fo ... t/19666786Having researched further after getting the Dells and before nailing the calibration, I'd consider Eizo's CG range, though the cost is rather higher and there have been reported issues with those too.
Good luck! Choosing a monitor and achieving accurate calibration at the budget end is a minefield (which seems to be anything below at least $5K if not rather more for each piece of glass), but satisfying once you have it sufficiently figured out.