Hunter x Hunter
Bleach, but only til the end of the soul society arc. Top tier show til then, then it starts to drop.
Hellsing ultimate (and its youtube abridged series)
Berserk golden age trilogy
*One piece. Amazing show, anime has some major flaws and takes some getting used to, but once your hooked its the best show of any format or genre. All about that world building. Manga is superior.
Berserk. Anime old anime uses too many still frames and new anime is garbage cgi. Manga is superior and far ahead.
Gantz. Amazing show that gets better with every arc til the apocalyspe. Anime stops at the first really good arc ans then ends it with a terrible arc that was never in the manga.