Anyone tried overclocking the Dell 55" Monitor?

[-fred-]

I am assuming I would be able to achieve at least 75hz. I am looking for a large display but do not want
to buy a tv because of the input lag so I have been looking at Public Display monitors from Samsung, Nec and
then I found th Dell E5515H Monitor which is a great price but I can not find any in depth reviews about it.

I was thinking of maybe just buying a led projector, but was wondering is it possible to overclock
the projectors refresh rate so it will refresh at 120hz there by solving the problem of the rainbow effect?

So either I will buy the 55" Dell or a LED Projector...