In reply to Dave:
As soon as I saw the heading I was going to recommend the Dell Ultrasharp models.
Excellent colour reproduction without going into the pro-end ££££ of monitors.
If you can afford it, look at the UHD / 4K models - a new camera will likely have around 12+ Megapixels, whereas 1920x1080 is 5MP (I think?).
If you've already got a flat monitor, I'd also keep that and look at having a dual-screen setup. Really good for photowork - can have a grid/library in one (non-accurate) screen, then do you processing on the main one.