http://www.behardware.com/art/imprimer/641/
is a very old post but helps to make the difference between 50-100 hz
gab here are 2 models
http://www.product-reviews.net/2008/08/26/viewsonic-120hz-vx2265wm-lcd-prototype-revealed/
http://www.clutchkills.com/videos/samsung-2233rz-review/