Do you shop for cruises that go to specific ports, have more or less sea days, leave on a certain day of the week?

I am trying to choose the "perfect" cruise for November/December and having a difficult time picking what I want to do.  The only input hubby will give me is that he doesn't want more than 2 sea days in a row (not including embarkation and disembarkation day)...

We both want the Caribbean and I've been to every port on the Southern and Eastern routes (don't want to do Western). Suggestions?