Hey , if you have a green team GPU I will suggest waiting for the Asus 24' g-sync monitor http://www.fudzilla.com/home/item/32882-asus-confirms-24-inch-g-sync-monitor-for-
And if have a red team GPU I would wait for BenQ and Viewsonic FeeSync monitors
http://www.fudzilla.com/home/item/36389-benq-and-viewsonic-feesync-monitors-in-time-for-holidays
And if you can't afford the premium of Freesync/Gsync , go with the xl2411z or xl2420z
they are better then the VG248QE because they have no PMW flicker and they support benq ULMB that is better then the VG248QE first gen light boost hack.
You can go with the XL/T if you don't need ULMB , because they are cheaper then the XL/Z and have no PMW flicker that the VG248QE have and support the same lightboost as the VG248QE.
Plus some say that BenQ have better colors then the VG248QE in lightboost mode.
And if you don't care about lightboost at all, and don't sensitive to PMW flickering there is no reason to go with the VG248QE , just get the cheapest 144hz monitor you can get (probably will be the AOC,Acer or the Philips models).
BTW , maybe the AOC,Acer or the Philips don't have PMW flickering ,I have not checked it, so I will leave you to to check which one is the best.