I’m in a pre-Crisis mood right now, so my answers will be all Pre-Crisis, minus one series.
New Teen Titans
Legion of Superheroes
Wonder Woman (especially the Conway/Thomas runs)
Batman/Tec (from Conway through Moench)
All-Star Squadron
Bates’ Flash, from issues 270 up until the Trial. Slept on run, and one of the first long form soap operatic series in the pre-Crisis era.
Green Lantern by Wolfman through Wein
Action Comics by Wolfman/Kane
DC Comics Presents
Justice League of America
The Aquaman story running through Adventure Comics
But Perez’s Wonder Woman is my absolute favorite.