I think everyone makes some good points, but any eventual decision has to balance priorities. There are always trade offs. For some people, the ship IS the cruise. For others, it is the Ports, and for yet others, price is key.
For me, the decision was easy - the Dream. To me the Ports are what makes a cruise. And the price also plays a big role.
The Dream is a good ship, and where else can you take a 14 day cruise around the Horn for only $699 for an ocean view room?