try vampire knight (really addicted to it since it was animated from manga version) Top -secret : a mystery type of manga, but it released every like 3 months or so  ahh what else? ooo Macross Frontier.. anime version definitely a must see   O genki desu ka?

Depending on what kind of story you like, Death note is a really good manga that is full of action and the plot is amazing. As for more of a fantasy/action theres Rebirth if you liek vampires and Ragnarok if your into Norse Mythology. Both have a bunch of action along with a badass fantasy twist ^.^ as for classics theres Inuyasha, Trigun, Cowboy Bebop and many others. Oh almost forgot to say Black Cat, its more of a cowboy bebop type and has to do with two bounty hunters. I'd suggest any of the ones i named ^.^ sorry cant recommend any romaces or anyhting liek that, not exactly into it lol, closest to that i have read is ranma 1/2 , its martial arts + romance.  "Don't doubt the darkness, it can be your enemy as well as your friend."

Bizenghast, Chibi Vampire, Angel Sanctuary, Negima! People fear the strange and unusual. I AM the strange and unusual.

You might want to try Rurouin Kenshin.  It is an action manga with lots of sword fighting and has a really good story.  It is about a Hitokiri Battosai (an assassin ) who decided to stop being an assassin and stop using his katana, instead switching to a reverse blade, and his adventures. ~Niji Hana~

i would say try out rosario + vampire it's realy realy good the story is is very much wel done. a nother one is full metal panic it to has a very good story and it's just very very good.