Here is an interesting read on the different battings Hobbs offers:
http://www.hobbsbondedfibers.com/products-retail.html
I went to the AQS show in Des Moines last year, and Hobbs had a booth - I purchased a sample pack of all their batting (one big square of each all fastened together) - very inexpensive, and an invaluable resource for my sewing room! It would be easy to make your own as you try different battings by just cutting a square of the leftover and labeling it.