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if you havent read "harry potter" then you have ur series right there. also the "uglies" series is very good. and "the house of night series" is awesome too. oh and "the sisterhood of the traveling pants." good luck!

The Pretty Little Liars Series - Sara Shepard, The It Girl Series - Cecily von Ziegesar, The Mediator - Meg Cabot. Hope l could help!

Harry Potter. I know everyone will say that though. I don't know about series but my two favorite books are Gone With the Wind and Timeline. But you would probably enjoy the Princess D's from Meg Cabot if you enjoyed Twilight. I hope this helps.

The Twilight Saga:

Twilight

New Moon

Eclipse

Breaking Dawn

...

I enjoyed the "Lord of the Rings" book series. The "Hobbit" is the prequel to these books, and it is a really fun one to start with. They are all full of creativity, fantasy, and adventure. These books can immerse you into a whole different world, which is kinda cool.

ARTEMIS FOWL

And

Try out 'the name of this book is secret'. There are only 2 books, but I just looovee that series.

Midnighters

The Clique

Pretty little liars

Confessions of Georgia Nicolson

Avalon High

His Dark Materials by Phillip Pullman.

Its more of a fantasy book, but there is romance in the last one.

the dark elf series by R. A. Salvatore is amazing

his series the cleric quintet is also very good

Nothing beats Twilight...

But check out the Barnes and Noble site...

http://www.barnesandnoble.com/subjects/teens/index...

Just look around the site. They have summaries, and you can see what books you like.