The sooner you book the better the price, I think (I'm sure someone will correct me) you can then apply your on board discount to the existing booking? Yes? No?
I agree. I think summer 2011 prices on the Dream will keep going up, so I would book something ASAP to lock-in the price. You can rebook the cruise while on PCC 2.0, but you'll get the current price at the time of your onboard booking, minus the 10% discount, plus onboard credit. If I were a betting woman, I'd say the price of a June 2011 Dream cruise will be higher in Dec. 2010, even after the onboard booking discount, than if you booked it now.