Review - Acer Predator XB252Q a good choice if you're dead set on 240Hz - GameAxis
Acer Predator XB252Q 24.5" Full HD G-Sync 240Hz | Box.co.uk
Amazon.com: Acer Predator XN253Q Pbmiprzx 24.5" Full HD (1920 x 1080) TN 144Hz Gaming Monitor with NVIDIA G-SYNC (Display Port & HDMI Port),Black : Electronics
Amazon.com: Acer Predator XN253Q Pbmiprzx 24.5" Full HD (1920 x 1080) TN 144Hz Gaming Monitor with NVIDIA G-SYNC (Display Port & HDMI Port),Black : Electronics