Re: Your top 5 DC graphic novels...
Forgetting Watchmen & Sandman for a moment and just sticking with the mainstream DCU these are mine in no particular order
New Teen Titans: The Judas Contract
The Flash: Blitz
Batman: Strange Apparitions
Superman: Whatever Happened to the Man of Tomorrow?
JLA: Rock of Ages
Pull list: Saga, The Manhattan Projects, Thief of Thieves, Teenage Mutant Ninja Turtles, Future's End, Action Comics, Detective Comics, Aquaman, Wonder Woman, The Flash, Green Lantern, Green Lantern Corps, Red Lanterns, Swamp Thing, Justice League, Justice League 3000, Justice League United, Earth 2, Earth 2: World's End, Worlds' Finest, Batman '66, Batgirl, Gotham Academy, Multiversity, X-O Manowar, Unity, Bloodshot, Archer & Armstrong, Daredevil, All-New X-Men