I like Hobb's 80/20 a lot and use it most of the time. I usually prewash it (soak in washing machine, rinse and spin - no agitating) and then dry it on my dining room table. Fairfield also has a 80/20 but it's quality isn't a good as Hobb's.
I like a good poly for baby and kids quilts. I like these quilts to be light weight. Also I feel these quilts will get a lot of washing and drying and poly works best for that. Recently heard good things about Hobb's Poly, haven't seen it available in local shops so I ordered a queen size batt with my last order from Connecting Threads.
Quilters Dream is a dream, more expensive but I've used it for 'special' quilts.