I cut my bindng strips 2 3/4". Use the walking foot as a guide for the seam width, which is a little over a quarter-inch seam. When I wrap the seam to the back it is a little wider than the wrap from the top. This makes it nice for stitching in the ditch if I care to do that OR I can hand stitch.
After the cutting and piecing process, binding is up there on my list. It's a good feeling to know that I'm almost done with this quilt.