I beleive plasmas have a higher current draw so there is the power consumption, plus plasma seems to be a fading in popularity, there were many more lcd and led tvs available during my last purchase. But I will agree the picture was great, the noise was unbearable, and I would check the ratings carefully, after my purchase I checked others having issues with the buzzing and it was widespread on the panny g20 and g25 and many people were stuck with repairs that didn't correct the problem, I am happy to report that both my lcd's are quiet as a mouse.
Shayne