Got me one of those newfangled eMacs myself, and the refresh rate at 1152x864 is 80Hz, only 72Hz at 1280x960. 89Hz at 1024x768, but that's silly.
Before I got the eMac, I thought I'd be running it at 1280x960. However, at that resolution, everything looked too small on the screen for me. It didn't flicker; I couldn't tell that it was such a low refresh rate. But damn, were things too small. So, I run it at 1152x864 and everything is just the right size. The screen does not flicker; yay.