Eizo FG2421 240Hz turbo works for what it is (I have one). It makes motion clarity and such very nice. My personal issue with it is flicker, which all low motion blur technology implements. The reason is the backlight flicker is to have a small impulse to the usual post and hold for LCD/Plasma/OLEDs but to emulate CRTs in which a frame is drawn for only a small time.
The G-sync module is no longer for sale for VG24#QE. It's also a poor monitor to begin with.
Of the 120/144Hz from BenQ I'd go with XL2420Z. It has their "Low motion blur" (that is it's name) tech and low blue light mode. It's not the same as XL2420T.
I should probably link the reviews for all of these, but they're all over the place and I'm lazy. They're somewhere on tftcentral, prad and pcmonitors.
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Personally I'm waiting for AUO's AHVA 2560x1440 144Hz. 6th one down in the 27" section.
http://www.tftcentral.co.uk/articles...anel_parts.htm