Review on Dell UltraSharp 104P6: 27" 2560X1440P Monitor with Plug and Play, Built-In Speakers and Kensington Lock (Discontinued) by Deshaun Parham

Overall fantastic but with complaints. You'll need to update it with some third-party settings files if you want to use it with newer Macs and Displayport, and Displayport has some glitches from time to time when it wants to randomly and repeatedly put the monitor into sleep mode, but other than those things the list of prices and specifications speaks strongly for it compared to Apple's outrageously expensive monitors.