I've been stuck with my Dell U2410 monitor for a long time, been wanting a larger monitor with a higher resolution and a higher refresh rate, but don't want to compromise on the quality of an IPS panel. Looks like there's finally one that brings it all.. higher resolution, IPS panel, fast pixel response times, G-Sync, 144Hz refresh rate, minimal input lag.. seems too good to be true, but the tests show it to be what it claims to be!
http://www.tftcentral.co.uk/reviews/acer_xb270hu.htm
About the only down sides are 16:9 instead of 16:10, and it isn't really high resolution retina type display. In a perfect world it would be double the 2560x1440 and be a 5120x2880 monitor, great for normal work, then in gaming be 2560x1440.
Still will definitely take a long hard look at this monitor.