How are you planning on quilting it? If sent out to a longarmer flanges can be very troublesome and often add to the cost. If quilting yourself, they can also cause the same issues in that it is difficult to avoid them and not quilt over them and sometimes when you quilt over them they catch under the foot and get stitched down going the wrong way.
If you are hand quilting then flanges are usually no problem at all as you can easily avoid quilting on them when doing by hand.