Magictam has some good info. We usually book balcony cabins, and we are booked on the Zaandam in April 2008.
Deluxe verandah cabins are usually a little larger, and I think you qualify for concierge ammenity.
They are very nice and usually have choice locations. They also have a whirlpool bathtub, which I like.
Look at the deck plans to make sure what is directly above your cabin. I also don't like a cabin directly over the lifeboats. I want to see below.
I study the deck plans quite a bit before I call my travel agent, then I tell her what rooms I am interested in.
The TA can do all that for you if would rather trust their judgement.
Have a good time !