My eye's seem really sensitive to this setting and anything below 75 hurts (no pun intended) so the higher the better but are a lot of LCD's capped at 60Hertz?
most are limited to 60hz when displaying at their native resolution, this is where the 2233rz is different.
the sammy 2233rz has a refresh rate of 120hz when set at 1680*1050 which is better than most crt monitors.