Megadeth Rust in Peace is definitely up there with me. Mastodon most of the time. Pelican's Drought is probably one of my favorites if not my favorite tone. Then Bill Steer from Carcass. Love Napalm Death stuff like Suffer The Children, Entombed, Obituary, Morbid Angel.
Having said that Motley Crue's Shout at the Devil holds a special spot for me. As far as punk rock goes I really love East Bay Ray from the Dead Kennedys... just an odd ball tone which worked well with them. Misfits Walk Among us, early Buzzcocks..
But If I had to absolutely say 1 tone is my favorite definitely Pelican's on the song "Drought". Good god it sounds amazing