I use Warm & Natural but most folks think it's difficult to hand quilt through due to the scrim. I don't really have a problem with it...perhaps because it's what I've always used and don't know any better! A friend uses Quilter's Dream 100% cotton and it does have a very nice drape. If I ever finish up the roll of W&N, I'll give that a try.
One of these years I'd love to try a silk batting but it would have to be for an heirloom piece as the silk is so expensive. And I'm not sure I'm an heirloom quilter!