I have to agree, without books life is not worth living. Ask my already big and growing collection of books and manga (probably have close to $1,000.00 worth of stuff that i bought on there).
I agree the Elfen Lied manga is a bit difficult to get through, Still my favorite though.
Fruits Basket is a good one I thought, good story and no loose ends at the end, and plenty of stuff to make you laugh and sympathize with the characters