Boy there are lots of old trades that rock plus new series that are fantastic too.
Old:
Batman Year One
Batman Hush
Batman The Long Halloween
Batman The Dark Knight Returns
Daredevil Born Again
Daredevil (Bendis/Maleev and Brubaker runs)
All-Star Superman
X-Men The Dark Phoenix Saga
Daredevil the Frank Miller run
Moon Knight The Bottom
Ex Machina
The Walking Dead
Wolverine Limited Series (Claremont/Miller)
Silver Surfer Requiem
New:
Start with #1s of these series
Batman (New 52)
All New X-Men
Thor: God of Thunder
Daredevil
Hawkeye
Superior Spider-Man
Tons and tons more that I haven't even read yet
Old:
Batman Year One
Batman Hush
Batman The Long Halloween
Batman The Dark Knight Returns
Daredevil Born Again
Daredevil (Bendis/Maleev and Brubaker runs)
All-Star Superman
X-Men The Dark Phoenix Saga
Daredevil the Frank Miller run
Moon Knight The Bottom
Ex Machina
The Walking Dead
Wolverine Limited Series (Claremont/Miller)
Silver Surfer Requiem
New:
Start with #1s of these series
Batman (New 52)
All New X-Men
Thor: God of Thunder
Daredevil
Hawkeye
Superior Spider-Man
Tons and tons more that I haven't even read yet