Re: Restoring the Ceiling Height...yes or no
If it were me, I would. I prefer the higher ceilings and don't think that lowering the ceilings cut heating and AC costs by that much. As far as costs go, it depends on how it was done, what is above the suspended ceiling, and the amount of damage cased by it's installation. I think most people interested in older homes would prefer the original ceiling height, so it would make it more marketable in my opinion.
Be sure you live your life, because you are a long time dead.-Scottish Proverb