Hard to narrow it down...
All-Star Superman
Alan Moore on Swamp Thing
Wolfman and Perez on Teen Titans
The Sandman
Englehart and Rogers on Batman
Marston and Peters on Wonder Woman
Greg Rucka on Wonder Woman (both runs, but mostly the first)
Kirby's Fourth World Saga
Grant Morrison on JLA, Doom Patrol, Batman, Seven Soldiers and New 52 Action Comics
Geoff Johns on Green Lantern, the Flash (first run), Aquaman
Ellis on the Authority
Watchmen
Rucka and Williams III on Batwoman
Current: Tom King on Batman, Steve Orlando on Supergirl, the Wild Storm, Way on Doom Patrol