Battle Angel Alita's pretty cool.
Although it seems to me like I'm the last person in the world to read it -_-
You are not alone, my brother.
Battle Angel Alita and the new series, Battle Angel Alita: New Order, are my favorites so they get my recommendation. It has a lot of martial arts action cyborg style and gets into a lot of philosophy. It does have a lot of blood and guts so if that bothers anyone, you'll want to step clear of it.
There's one called Kaze Hikaru from Viz that came about less than a year ago. It follows the struggle of a 15 year old girl who disguises herself as bushi in 19th century Japan to avenge her family. Kaze Hikaru is surprisingly deep but light on action. It may seem like another romance title for girls on the surface, but it really has depth and meaning to it beyond it being a another love story or a historical drama.
There's also Cromartie High School from ADV Manga. It's hard to explain. It stars various High School deliquents, a Gorilla, and Freddie Mercury from Queen. It's hilarious, trust me.