If you can hold out, I'd wait for the monitors that should be out any time now with Nvidia's G-sync technology. They'll have higher resolutions than 1080p available with no blur, little input lag, and no tearing.
If you don't want to wait for G-sync monitors, I'd go with the XL2720Z. I like the 27" monitor with the high refresh rates. For MMOs, you might not appreciate it as much, but when you play BF4, you will appreciate it immensely. The higher refresh rate monitors will give you little perceivable tearing compared to the 60Hz monitors.