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, Teenage Mutant Ninja Turtles, Justice League, Earth 2, Multiversity, Daredevil, All-New X-Men