Mallory, in our villa we had 5 1/4 put in. Personally I wouldn't go larger than that in our Villa. But that's all personal preference. They have a special right now of a free upgrade from 4 to 5 1/4 in. not sure of other sizes. If you go to their web site and click on crown moulding, there are photo's and also prices listed for the different models in TV and Spruce Creek.
http://www.creativefinishcarpentry.com/