Julie, I have been raising different varieties of jasmine and other fragrant plants for years. In fact I started a new forum on Cubits.org you may want to visit. There is a thread on the Confederate Jasmine or as some people call it Star Jasmine. You may also like the other one called African Gardenia.
http://cubits.org/JBsPlants/fo...
There are many different Jasminum Sambac and they are wonderful plants for someone in your Zone. You can take a look at Top Tropicals website and they used to have a little booklet called Jasminum Sambac the Absolute Flower. Most of these have very heavy scents.
http://www.TopTropicals.com
Hope this helps you in choosing your patio plants.
