Bella Quilts in Hamilton, OH is awesome, and Best Friends Quilting shop in Cincinnati is also pretty darn good. There are a couple of shops in Sharonville, called Sew-Easy and Aunt Ruth's Quilt Store (both on Reading Rd, about 4 blocks from each other)that are smallish, but have a really good selection of fabric, books, and tools. I do not know of any specifically in/around Dayton, but have to agree that the Fabric Shack in Waynesville is worth a trip.
Maybe you ought to take a day trip and go visit all of them :)