Reforce (RefreshForce aka RefreshLock) is what I've used for a long time -- especially when I got my trinitron.  Without it, I wouldn't have been able to take advantage of the high refresh rates that the trinitron offers.

One note of mention for ATI drivers (I use omega drivers, but it still should apply), in the displays tab you will see your monitor(s).  From my experience, the driver screws up some of your refresh rate forces even when using the RefreshForce app.  For instance, at 1280x960 I wanted to use 120hz.  This was impossible while the driver option in the above mentioned location had Refresh Rate Override option at anything other than Disabled and the Use DDC information selected.  You might find similar problems at lower refresh rates in which you know the bandwidth a frequency ranges should support a resolution and refresh rate but cannot attain it.  T

This does not apply to situations in which you see the "Signal out of range" or "Frequency out of range" type errors.  These errors are actually the monitor telling you that the signal being fed to it is not within its capabilities.  This only applies to a situation where you have a refresh rate that won't get set (i.e. my case of wanting 120hz but being limited by the driver to 100hz).