That sounds fantastic Joe! I am glad Italy and Tuscany made a good impression on you and your fiance' and that you're coming back next year .
Don't hesitate to post any doubts or questions you might have as you start planning your trip. Even if we're the only ones to answer, we hope to provide useful suggestions .
For example, did you visit at all the area to the south of Siena? I don't think it was on your itinerary and I really recommend passing a day or two in the area of the Val d'Orcia. Did you make it to San Gimignano?