I agree with the Quilters Dream batting choice. Their cotton batting has three lofts, making it easy to chose the one you need. I personally prefer wool batting for the drape, washability, hand quiltability and the fact that it is warm in winter, cool in summer - as most natural fibers are. Both Quilters Dream and Hobbs batting make a wool batt.
This site will tell you about the different QD battings, and you can find them in several places online so you can compare prices. Same with Hobbs, which is often on sale at Connecting Threads.
http://www.quiltersdreambatting.com/