I like the wide back but my LQS doesn't carry a a big selection of it. That last time I went to get a wide back, I had to settle for 45 instead to match the quilt. I don't have to have the quilt top and back super matchy but I do like the binding to look nice on both sides.
I don't mind piecing the back since Bellaboo gave me a trick to do it. You sew down both selvage sides to make a giant tube. You then open the tube and cut down the center of one piece. You then have the quilt back in three sections which is recommended for a pieced back.