It actually depends on you , what kind of games you'd be playing.
BenQ XL2411Z has a bit better color quality than the Asus VG248QE , more suitable for FPS games. Also it has motion blur reduction, though the stock presets are shite , its still better than the ASUS one. The Acer one is definitely not worth the extra money.
If you could stretch your budget i'd suggest you XL2420G, its the best 24inch currently available.