depends on what you want.. personally, on a 3 or 4 day, ocean view is really enough for me.
But then again, I have lucked out and had a verandah on my past two 7 days, and got an upgrade for my upcoming 4 day.
If you can, there are some obstructed view ocean view staterooms, you get the natural light, and a tiny view.. but the windows are so ubstructed that they are priced at an inside room rate.
Or, there are also the CAT 7, navigator verandahs, which is a partially inclosed verandah.. they give you that extra verandah space, but aren't as pricey as the CAT 5 or 6.
Cat 9's are cheaper, and you get the ocean view, the ones on deck 1 have two small portholes though, but I really liked deck 1 the times I had it. CAT 9, is also on deck 2, and they have the regular size portholes, but there are several rooms on deck 2 that have become known as "noisy" rooms, mainly because they are located under the night clubs, or restaurants.
If you are really looking for a bargin.. I'd look into the secret porthole rooms, which are the obstructed oceanview, at the inside price.