Refresh Rate on an external monitor on 24" iMac

"I solved this particular issue by using VGA instead of DVI->HDMI.

I didn't use VGA because my housemate's display did not work correctly under VGA on the same machine.

Some things I noted that may be of future reference to other people with this issue:

When I plugged the monitor in via DVI -> HDMI, the computer set the refresh rate to 59.9 hz.
Additionally, SwitchResX was reporting all sorts of timings that just didn't seem right. This leads me to believe that there's either an issue with the cable, or there's a problem reading EDID information from a monitor connected in this fashion.
When I plugged in to VGA, the monitor picked up the refresh rate at 59.9 hz, but instead had the proper list of refresh rates to choose from, and the flickering stopped.

There's been a lot of information regarding this issue, especially when attempting to use a Mac as a HTPC. Unfortunately, the problem is on Apple's end - their software is not playing ball with other displays.

(You can prove this with Boot Camp, most displays appear to work fine on the same hardware)"