I love the look of the Sylvesters, but don't know how cold hardy they are. This was an interesting link about Queen Palms:
http://www.sky-bolt.com/queenpalms.htm
The writer uses good references, and claims the Queens are not cold hardy below 25 degrees, are not wind resistant and are not drought tolerant, hence not recommended for central or north Florida. One thing I have observed is that they grow very tall, and very quickly. In just a few years it will be difficult to trim the brown fronds yourself, you'll need to get a landscaper to come in a do it for you since the trees are so big, and this will be a maintenance cost to keep in mind.