How big are your squares? Will your batting allow you to just STD the sashing? I echo stitched just inside the pointed edges of my Dresden plate. Looking at it now I realize it should have more quilting. Could you do a small motif in the corner of each block and the center of each Dresden? Maybe a couple of rows of echo stitching inside each block?
Whatever you decide, it will be a great quilt. I love Dresdens and your fabric is wonderful.