Yeah also aside from the jitter issue, 24hz also has issues with lip sync after pausing the movie for awhile, so I've put it back to 60hz and all is good again. I may have paid a bit more than I intended, but I'm glad I got a screen that works well with DVI-HDMI (based on Jon's post, thanks!), if I'd got one that wouldnt display properly from PC I would have been screwed.
Anyway, 60hz isnt that unsmooth anyway, still looks great IMO
So even if I'd got a "real" 5:5 120hz screen, I wouldnt be using 24hz probably anyway due to the issues.