Hi .. If you liked Cell as much as I did. you may also like "The Stand... (the complete and uncut edition) " by the same author.. it is also PA , but is mainly a battle between good and evil. its is a very good read and not a bad tv series too.... M O O N , that spells good
(you'll get it when you read the book)
also you might consider the "Dark Tower" series ... you could kind of call them PA in paralel universe.... sort of. They are also by Stephen King.