Have you ruled out Warm & Natural? It's low-loft, 100% cotton, washable, preferred by those I know who quilt on their home sewing machines, and can take pretty close quilting (I think - others can correct me if I'm wrong).
While price isn't an issue in this case, I bought some at Hancock Fabric this afternoon and was able to use my 40% off coupon.
Having read the Quilting Board for about a year now, it seems that a plurality (and maybe a majority) of us prefer W&N to other batts for most projects.