I got some fabric at an estate sale called "Northcott Silk". It is not silk but it is quilting cotton. This is the most amazing stuff! Really different from other fabrics. I will say that Maywood seems to be the heaviest and most reliable fabric - they just don't always have the prints I want. I've been folding up my quilting room so have had a chance to compare. Definitely Maywood is super high quality still - as some have gone down hill.
Another thing I have noticed is that the older Joann's or Cranston is really good quality fabric. As good as the brand names today. Some of the brands have gotten as thin as voile almost.