mana shield or no?

I say put into mana sheild because i do play hardcore lvl91 now using manasheild as well as my other friends. I havent put 1 point into energy and have 1k+ mana and 1k+life. your +skill items would boost it up to about lvl9 or 10 which would be about 65% dmg taken to mana, helps a great deal in hell.