If you're
sure that's the cruise you want, I think you should book Early Saver. If the price drops you can get the lower price.
BUT, be
sure to read the rules for Early Saver before you book

. If there's a chance you'll change your mind or have to cancel, that might not be the best way to book.
We had to reschedule our cruise and it cost us the $200.00 deposit

.
JMO,