I heartily endorse @cprevite‘s picks (well, except for Scalped, which I haven’t gotten to yet, and Daredevil, which has slipped through the cracks somehow).
When speaking of ongoing monthly titles, I’d also encourage you to take a look at the following:
The Walking Dead: A zombie movie that never ends.
Batman and Robin: The adventures of the new guys in the costumes (original Robin Dick Grayson as the new Batman and Damien Wayne, son of Bruce Wayne and Talia Al Ghul, as the new Robin). It’s written by Grant Morrison, who’s probably the best writer in the comic biz at the moment, and definitely the trippiest
House of Mystery: A house that exists between worlds, occupied by people without a home. You can only get served at the bar if you tell a story, and this series is filled with great little ones
Unknown Soldier: A doctor from the US returns to his homeland in Uganda and is ambushed by armed rebels. His face is scarred and bandaged, and there is a voice in his head which instructs him to kill those who would threaten innocents
Booster Gold: The buffoonish and superficial superhero has been recruited to protect the time stream, making sure that heroes like Batman and the Flash don’t get killed as children! He has to maintain the facade of a bungling hero so that no one catches on to what he’s really doing, making Booster Gold the greatest hero the world will never know
The Incredible Hercules: The adventures of the mythical demigod and his partner in crime, Amadeus Cho, the 7th smartest person on Earth
The Sword: A girl’s family is killed by a trio of superpowered siblings looking for a sword, the only weapon that can kill them. The girl finds the sword and seeks out the siblings one-by-one, to get revenge for the death of her family
Besides the ongoing comics mentioned above, there are tons of comics that have ended but are definitely worth checking out (in fact, I think comic series’ that have endings are better than most ongoing titles). For a super-long list of recommendations, check my post from another thread: http://www.fluther.com/disc/58589/what-would-you-all-consider-the-best-options-for-my-next/#quip851610