Pretty standard answer, but i would have to say Ride the Lightning (the only metal i have on vinyl, cassette and CD), closely followed by Iced Earth - Alive in Athens, which has to be my most played CD by far.
MASTER! MASTER!
WHERE'S THE DREAMS THAT I'VE BEEN AFTER?
MASTER! MASTER!
YOU PROMISED ONLY LIES!
LAUGHTER! LAUGHTER!
ALL I HEAR OR SEE IS LAUGHTER!
LAUGHTER! LAUGHTER!
LAUGHING AT MY CRIIIEESSS!