Welcome to QB. You'd be SO much wiser to keep an open mind and learn to judge fabric quality by actual experience, your own or that of reliable friends, not merely the name of the manufacturer. Making a list of "worthy" manufacturers is rather like making a list of states that are "worth" visiting. You won't know for sure until you see for yourself and you risk missing out on something wonderful.
Even with premium fabrics, it is wise to test a sample for shrinkage, bleeding, etc before use, especially in something made for sale.
Designer name has relatively little to do with actual quality of the fabric, btw, unless they are making their own fabrics. Also, Keepsake Quilting is a retail store, not a fabric manufacturer. The Keepsake Calico sold at JoAnn's has nothing to do with Keepsake Quilting.