If you can afford it, silk batting is very light in weight and easy to hand quilt. Seems suitable for this quilt. Hobbs has one that is 90% silk in their Tuscany collection. You might want to pre-shrink this batting (if it is possible to pre-shrink it; I'm not sure about that) as it can shrink up to 5%.
I would not want to send this quilt to the cleaners, as chemical cleaning isn't the best for fabrics. When it has to be washed, I would take it to a laundromat and wash it myself in their largest front-loading washing machine, then take it home and lay it out flat on sheet-covered carpeting to dry (with fans on it to speed drying).
The glazed hand quilting threads are made that way to prevent tangling. You can try quilting a sample with regular thread and see if you like it. When I have used regular cotton thread to hand quilt, I have found that it has a tendency to knot up on me (before I finish the line of quilting!). However, you can run it through beeswax or Thread Heaven to make it smoother and less likely to knot. Here are some links:
http://www.amazon.com/Beadalon-216S0...dp/B0052UN9MO/
http://www.amazon.com/Thread-Heaven-...dp/B0019CYD42/
I would also make sure that the regular thread is a high-quality thread such as Prescencia, as this type of thread will be more smooth and less linty (fuzziness of the thread causes drag). Be ***sure*** to try the thread out first before buying tons of it to make sure that you like it better than the glazed threads. My understanding is that most experienced hand quilters prefer the glazed threads.