Deb,
My dilemna is always the batting, 80/20 sounds good for machine quilting and looks like it would give a little poof. If the kids like the fluffier, cuddlier then I use high loft and tie it. It really is comfy, but I hear that tying doesn't hold up as well. Of course the flannel backing is a must, I didn't want to put it down when I was hand stitching the binding.
I love the way your rosebuds look, so the next class will be paper piecing.
Thanks for sharing!