Anyone know any popular, young-adult book series?

I am like dying from lack-of-reading-material so I need some new books to read. What I've read: Twilight Series Maximum Ride Series Eragon Series Chronicles of Narnia Underland Chronicles Harry Potter Series City of Ember Series... Uglies series.... A Great and Terrible Beauty series.. I like to read... show more I am like dying from lack-of-reading-material so I need some new books to read.

What I've read:
Twilight Series
Maximum Ride Series
Eragon Series
Chronicles of Narnia
Underland Chronicles
Harry Potter Series
City of Ember Series...
Uglies series....
A Great and Terrible Beauty series..

I like to read series books, so please only recommend books with at least three books in the series. BIG books, like at least four hundred pages in each book.

I don't mind if there are sex scenes or anything, but I'm looking for more young-adult like books.

Also, I want a book series that actiony, mysterious, adventurous, fantasy, and romancy. And sorta on the popular book series list, so I can talk to people about it.

Please don't say the Pendragon series because I hated those books...

Sorry for being so picky!
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