Looking For The Best Cruise

I'm trying to get an idea of what the best cruise is.

I guess I'm looking for what people think is the best cruise line and also what the best cruise route is.

The cruise will be for me and my wife. We are willing to pay a little more for a quality experience. We know most people take cruises in the Caribbean, but we are open to all destinations. We like the idea of a warm vacation in the midle of winter.