I was using a 1920x1080 Acer monitor for years, and just a couple of months ago I bought a QNIX 27" 2560x1440 monitor. ( QX2710LED )
I am VERY impressed with its quality, they use LG panels and skip all the circuitry. You can only adjust brightness on the monitor, no other settings.
I am even able to send my monitor a 2560x1440 120Hz signal and the monitor handles it fine. (My GTX 480 however can't power it)
At 1920x1080 your GTX 780 is barely sweating in most games, I would definitely consider getting a 2560x1440 monitor.
A heads up, the monitors ONLY support Dual link DVI-D/DVI-I