the batts from the dream company are wonderful to work with- they have dream cotton, dream poly, dream wool (my favorite) and dream orient-which is a bamboo-silk blend---very very wonderful but expensive.
when i am not using dream batts i usually choose a hobbs- they also make a wonderful wool batt- a number of different cottons and poly blends in various lofts- with various characteristics. if using a cotton batt i choose one with scrim (or bonded) they work best with the long-arm